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• Upgrade to 0.25, files served to uPNP devices cannot play

  - by David Buttrick

  I have a Sony BDP-S390 bluray & network player. I upgraded my Myth server to 0.25. When I browse to the Myth server, and try to play a recording, I get an error message about the file not being payable in the player. Interestingly, the files that i have recorded, and the videos that I have loaded into my Video volume group are .mpg or .mp4. The player shows the filetype that it thinks the file is in it's list, and it claims that these files are AVI files, however none of them are. They are all .mp4 or .mpg files. Thinking that that was just an optical illusion, I went ahead and tried to play a file, but I get an error about the file not being playable. First of all, is there something that I need to do to make the uPNP server know about different filetypes? Is it reporting AVI because it hasn't been told about MPG or MP4? Second, I'd like to help out some more here and collect some logging about the uPNP server in the myth server. I cant seem to find information on how to turn on logging, and there is no mythbackend settings file int /etc/default. Thanks very much.

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• Disappearring instances of VertexPositionColor using MonoGame

  - by Rosko

  I am a complete beginner in graphics developing with XNA/Monogame. Started my own project using Monogame 3.0 for WinRT. I have this unexplainable issue that some of the vertices disappear while doing some updates on them. Basically, it is a game with balls who collide with the walls and with each other and in certain conditions they explode. When they explode they disappear. Here is a video demonstrating the issue. I used wireframes so that it is easier to see how vertices are missing. The perfect exploding balls are the ones which are result by user input with mouse clicking. Thanks for the help. The situations is: I draw user primitives with triangle strips using like this graphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleStrip, circleVertices, 0, primitiveCount); All of the primitives are in the z-plane (z = 0), I thought that it is the culling in action. I tried setting the culling mode to none but it did not help. Here is the code responsible for the explosion private void Explode(GameTime gameTime, ref List<Circle> circles) { if (this.isExploding) { for (int i = 0; i < this.circleVertices.Length; i++) { if (this.circleVertices[i] != this.circleCenter) { if (Vector3.Distance(this.circleVertices[i].Position, this.circleCenter.Position) < this.explosionRadius * precisionCoefficient) { var explosionVector = this.circleVertices[i].Position - this.circleCenter.Position; explosionVector.Normalize(); explosionVector *= explosionSpeed; circleVertices[i].Position += explosionVector * (float)gameTime.ElapsedGameTime.TotalSeconds; } else { circles.Remove(this); } } } } } I'd be really greatful if anyone has suggestions about how to fix this issue.

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• Dual Boot menu with Ubuntu and Windows 8 not showing up

  - by user180630

  I know a lot of posts have been written, and I had read most of them when I encountered the problem. None of them solved the problem. I have successfully installed Ubuntu 12.04 on top of Windows 8. Now my PC simply boots into Windows 8. If I press 'Esc' at start of BIOS, and then F9,the GRUB shows up and Ubuntu is listed at the top of the several options to boot from. I did run Boot-Repair once I logged into Ubuntu explicitly from GRUB as mentioned above. I did all said by Stormvirux in this link but was still unsuccessful. The debug info is listed here. Something which confuses me is the message which Boot-Repair stated after it did its job. You can now reboot your computer. Please do not forget to make your BIOS boot on sda (8004MB) disk! The boot files of [The OS now in use - Ubuntu 12.04.2 LTS] are far from the start of the disk. Your BIOS may not detect them. You may want to retry after creating a /boot partition (EXT4, 200MB, start of the disk). This can be performed via tools such as gParted. Then select this partition via the [Separate /boot partition:] option of [Boot Repair]. (https://help.ubuntu.com/community/BootPartition) I don't know why it says it is far from the start of the disk as I see it first in the GRUB menu which comes up at startup. One more input, when I try to place the GRUB in sda, Boot-Repair does not progress giving me the following error: GPT detected. Please create a BIOS-Boot partition (>1MB, unformatted filesystem, bios_grub flag). This can be performed via tools such as Gparted. Then try again. Alternatively, you can retry after activating the [Separate /boot/efi partition:] option. I had to select Separate /boot/efi partition: sdb2

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• Valid reason for employer to breach freelance contract

  - by Costas

  Please don't close this as offtopic. According to the FAQ I can post programming related questions. I was working on a project and when it was half way completed (1 weeks work), the employer backs out and refuses to pay me. Shortly before this he was being very rude. He was having problems configuring the server and he told me it was my fault and that I had to fix it. After I spent several hours trying to figure out the problem, it turned out to be his fault. After this when I put the code on the server. He found 1 bug that I had missed. He freaked out, accused me of being a bad programmer and told me that the code was shit and that he couldn't use it. He said that if there is a bug in the code, that means the code is bad and he can't use it. He would have to throw the code away and hire someone else. His kept reiterating his argument: "why should I pay for code that I can't use". And I kept telling him the code was fine and urged him to have another programmer give him a second opinion. But he would have none of that. He said he would compensate me for my troubles by paying me 250$. Then he changes his mind and lowers that to 200$. Then a third time he changes his mind and says he doesn't want to compensate me at all. I'm left frustrated because besides being rude, he did not at any time tell me he was unhappy with the work that I was doing. So my question is; Is the above a valid reason to back out of a verbal contract in your opinion?

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• Weird 302 Redirects in Windows Azure

  - by Your DisplayName here!

  In IdentityServer I don’t use Forms Authentication but the session facility from WIF. That also means that I implemented my own redirect logic to a login page when needed. To achieve that I turned off the built-in authentication (authenticationMode="none") and added an Application_EndRequest handler that checks for 401s and does the redirect to my sign in route. The redirect only happens for web pages and not for web services. This all works fine in local IIS – but in the Azure Compute Emulator and Windows Azure many of my tests are failing and I suddenly see 302 status codes where I expected 401s (the web service calls). After some debugging kung-fu and enabling FREB I found out, that there is still the Forms Authentication module in effect turning 401s into 302s. My EndRequest handler never sees a 401 (despite turning forms auth off in config)! Not sure what’s going on (I suspect some inherited configuration that gets in my way here). Even if it shouldn’t be necessary, an explicit removal of the forms auth module from the module list fixed it, and I now have the same behavior in local IIS and Windows Azure. strange. <modules>   <remove name="FormsAuthentication" /> </modules> HTH Update: Brock ran into the same issue, and found the real reason. Read here.

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• Software center is not working after attempt to install skype

  - by user288690

  I am completely new person on Linux. I installed it just today and i have to say I like them a lot, until I faced the problem. I was looking on the internet but nothing worked for me. After i downloaded skype and tried to run it, software center showed up and was loading something for 5 mins. then it just dessapeared. Now everytime I try to turn it on, the window is gone after 3 sec. I tried to kill it but didnt really wokrked. I get this message when trying to run it from the terminal: whats_new_cat = self._update_whats_new_content() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 240, in _update_whats_new_content docs = whats_new_cat.get_documents(self.db) File "/usr/share/software-center/softwarecenter/db/categories.py", line 131, in get_documents nonblocking_load=False) File "/usr/share/software-center/softwarecenter/db/enquire.py", line 330, in set_query self._blocking_perform_search() File "/usr/share/software-center/softwarecenter/db/enquire.py", line 225, in _blocking_perform_search matches = enquire.get_mset(0, self.limit, None, xfilter) File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__ if (not pkgname in self.cache and File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 281, in __contains__ return self._cache.__contains__(k) AttributeError: 'NoneType' object has no attribute '__contains when trying to kill it via terminal, it says there is no process like this. Thx guys for help! Help me like Ubuntu for rest of my life! :P

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• IRQ Conflicts Causing Video Card and Boot Problems?

  - by sanpatricio

  tl;dr - I have 4 devices sharing 1 IRQ. Is this bad and how do I tell the BIOS to stop it? Background: I have an old Dell GX280 dual Pentium 4 that I (semi) resurrected last weekend with an installation of Ubuntu 12.04. Everything was going fine the first several hours until a problem that plagued me when WinXP was on that machine happened -- it froze. Completely froze. None of the myriad of ways I have found here on askubuntu helped me to regain control except a long-press of the power button to shut it off. Clearly, this wasn't a software/WinXP issue. After much googling, I found that hardware conflicts can often cause this sort of total lock-up and with all the odd blocks of yellow and flecks of color showing on my screen (both WinXP and Ubuntu) I figured my old GeForce 7600 was failing and causing me these odd issues. (A good canned-air dusting of the entire interior fixed the color fleck problem) Again, through much googling and numerous answers found on askubuntu, I somehow stumbled my way onto the lshw command. After going through it, line by line, I found that I have four devices sharing IRQ 16: eth0, wlan0, ide0 (DVD-RW), and my video card. In hindsight, I can recall weird instances of my Ethernet connection to another computer not working when I thought it should. I never full troubleshot those issues so it could be a coincidence. The other thing that has been plaguing me since installing Ubuntu (wasn't there during WinXP) has been periodic moments of my monitor getting no signal from Ubuntu during boot. The first couple days, it would disappear after the Dell boot screen and reappear at Ubuntu login. Now, it disappears after the Dell boot screen and doesn't return at all -- I have to hit F12 where I can load a safe mode version of Ubuntu and get more details like dmesg and lsdev. I also ran memtest86 overnight and woke up to zero errors, so failing RAM is out. Where do I go from here?

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• Can't connect to Wireless Network - Ubuntu 12.04 LTS & Sabrent A111N USB Dongle

  - by Ohgodwhy

  I've been trying to connect to this network for quite some time. I can't directly connect to the router with a Wire, but can access the Router with other wireless devices without any issues. I had previously tried several other Wifi nic's but none of them would load properly. Today, i went and bought a new (supported) Sabrent A111N USB Dongle, which said explicitly that it works with Linux 2.4 +. I popped the Dongle in, and low-and-behold it immediately said that there were Available Wireless Connections. I selected my connection and tried to connect, but it just loops constantly while saying Wireless Disconnected then attempts to connect again over and over. ifconfig and iwconfig both show my device in a ready and working state. However, iwlist wlan0 scan says that there are no results found. I don't get it... At one point, I could see the CPU in the DHCP client list under the router, but it doesn't fully make the connection (something about a timeout?). Any help would be appreciated. Bus 001 Device 002: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN

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• Why does my root filesystem keep becoming read-only?

  - by Scott Severance

  I've lately been having an issue with my root filesystem becoming readonly. It happens some amount of time after boot. I don't know exactly when it happens, as I don't usually notice it until something such as suspending the computer or printing fails. It seems to be fairly random. Since most of my system is on that partition, I can't re-mount it without rebooting. After this happens, the system runs a fsck. Sometimes it prompts to fix problems; other times it apparently finds none. To troubleshoot, I've searched through the logs but found nothing relevant. This might be due in part to not knowing when the actual errors took place. The filesystem is apparently good to begin with, as when fsck runs its fixes it doesn't report any errors. I've scanned the disk with SpinRite. A while ago, SpinRite found and recovered from some bad sectors on the hard drive. I ran a level 4 scan (a thorough scan) after this probem appeared, but SpinRite found nothing. The SMART data reports that the disk is OK with 63 bad sectors. The number of bad sectors hasn't changed recently. I realize that the disk isn't in the best of conditions, and I have complete backups in case of catastrophic failure. Yet the lack of errors in the logs, combined with SpinRite's test results and the unchanged SMART data makes me think that this problem has some cause other than disk failure. Other than disk failure, what could cause my symptoms?

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• Virtualization in Ubuntu 11.10

  - by Mascarpone

  Since Ubuntu 11.10 use a new kernel, it's very difficult to have a decent support for virtualization. VirtualBox doesn't support guest additions for ubuntu 11.10, so I can't copy to and from my ubuntu desktop and windows, which I absolutely require, plus FreeBSD seems not to be able to use DHCP without guest additions. Virt-manager instead gives an error on launch: Unable to open a connection to the libvirt management daemon. Libvirt URI is: qemu:///system Verify that: - The 'libvirt-bin' package is installed - The 'libvirtd' daemon has been started - You are member of the 'libvirtd' group unable to connect to '/var/run/libvirt/libvirt-sock', libvirtd may need to be started: Permission denied Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/connection.py", line 1146, in _open_thread self.vmm = self._try_open() File "/usr/share/virt-manager/virtManager/connection.py", line 1130, in _try_open flags) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 102, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirtError: unable to connect to '/var/run/libvirt/libvirt-sock', libvirtd may need to be started: Permission denied The problem is solved by running virt-manager as root, but I don't like that. How do I change permissions to run Virt-Manager as user? Is there a way to install guest additions on Ubuntu 11.10?

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• Languages with a clear distinction between subroutines that are purely functional, mutating, state-changing, etc?

  - by CPX

  Lately I've become more and more frustrated that in most modern programming languages I've worked with (C/C++, C#, F#, Ruby, Python, JS and more) there is very little, if any, language support for determining what a subroutine will actually do. Consider the following simple pseudo-code: var x = DoSomethingWith(y); How do I determine what the call to DoSomethingWith(y) will actually do? Will it mutate y, or will it return a copy of y? Does it depend on global or local state, or is it only dependent on y? Will it change the global or local state? How does closure affect the outcome of the call? In all languages I've encountered, almost none of these questions can be answered by merely looking at the signature of the subroutine, and there is almost never any compile-time or run-time support either. Usually, the only way is to put your trust in the author of the API, and hope that the documentation and/or naming conventions reveal what the subroutine will actually do. My question is this: Does there exist any languages today that make symbolic distinctions between these types of scenarios, and places compile-time constraints on what code you can actually write? (There is of course some support for this in most modern languages, such as different levels of scope and closure, the separation between static and instance code, lambda functions, et cetera. But too often these seem to come into conflict with each other. For instance, a lambda function will usually either be purely functional, and simply return a value based on input parameters, or mutate the input parameters in some way. But it is usually possible to access static variables from a lambda function, which in turn can give you access to instance variables, and then it all breaks apart.)

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• Problem with wake after suspend using USB remote.

  - by Bod

  Hi, I'm a linux newbie looking for some help. I'm currently setting up an XBMC HTPC using a laptop and 10.10 and all works great except for waking from resume using the power button on the remote. The suspend works from remote works fine as does the resume using the power button on the laptop. I've checked /proc/acpi/wakeup which initially showed the following. Device S-state Status Sysfs node C096 S5 *disabled pci:0000:00:1e.0 C0F1 S3 *disabled pci:0000:00:1d.0 C0F8 S3 *disabled pci:0000:00:1d.1 C0F9 S3 *disabled pci:0000:00:1d.2 C0FA S3 *disabled pci:0000:00:1d.3 C0FB S3 *disabled pci:0000:00:1d.7 C102 S5 *disabled pci:0000:00:1c.0 C22B S5 *disabled pci:0000:08:00.0 C115 S5 *disabled pci:0000:00:1c.2 C22C S5 *disabled C118 S5 *disabled pci:0000:00:1c.3 C22C S5 *disabled I've since configured the above so that the S3 devices above are enabled. I've confirmed that they are the correct devices using lspci 00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 01) 00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01) 00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01) 00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01) 00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01) None of this has worked unfortunately and I'm now stuck. It simply refuses to wakeup from the remote. The USB receiver shows no activity LED while suspended. Suspend/resume from the remote works fine from Windows 7 so I know the laptop is ok with it. Any ideas? I need to get this sorted to gain Wife Approval for this system. Thanks, Bod.

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• How to mount drive in /media/userName/ like nautilus do using udisks

  - by Bsienn

  As of my current installation of Ubuntu 13.10 Unity, when i click on a drive in nautilus it get mounted in /media/username/mountedDrive i read that nautilus use udisks to do that. Basically i want to auto mount my drive using udisks in start up using this method But problem is, it mounts the drive in /media/mountedDrive, but i want it the way nautilus do in /media/username/mounteDrive I want NTFS Data drive to be auto mounted at /media/bsienn/ bsienn@bsienn-desktop:~$ blkid /dev/sda1: LABEL="System Reserved" UUID="8230744030743D6B" TYPE="ntfs" /dev/sda2: LABEL="Windows 7" UUID="60100EA5100E81F0" TYPE="ntfs" /dev/sda3: LABEL="Data" UUID="882C04092C03F14C" TYPE="ntfs" /dev/sda5: UUID="8768800f-59e1-41a2-9092-c0a8cb60dabf" TYPE="swap" /dev/sda6: LABEL="Ubuntu Drive" UUID="13ea474a-fb27-4c91-bae7-c45690f88954" TYPE="ext4" /dev/sda7: UUID="69c22e73-9f64-4b48-b854-7b121642cd5d" TYPE="ext4" bsienn@bsienn-desktop:~$ sudo fdisk -l Disk /dev/sda: 160.0 GB, 160000000000 bytes 255 heads, 63 sectors/track, 19452 cylinders, total 312500000 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x8d528d52 Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 206848 117730069 58761611 7 HPFS/NTFS/exFAT /dev/sda3 158690072 312494116 76902022+ 7 HPFS/NTFS/exFAT /dev/sda4 117731326 158689279 20478977 5 Extended /dev/sda5 137263104 141260799 1998848 82 Linux swap / Solaris /dev/sda6 141262848 158689279 8713216 83 Linux /dev/sda7 117731328 137263103 9765888 83 Linux Partition table entries are not in disk order bsienn@bsienn-desktop:~$ cat /etc/fstab # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/sda7 during installation UUID=69c22e73-9f64-4b48-b854-7b121642cd5d / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=8768800f-59e1-41a2-9092-c0a8cb60dabf none swap sw 0 0 Desired effect: Picture link

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• Can't get wireless working after installing ubuntu 12.10 on acer aspire 5560-7414

  - by markdel

  I have been struggling all day trying different solutions from different posts on how to get my wifi working but none have worked. Any help would be greatly appreciated. Below are some wireless preferences to help find the problem. mark@mark-Aspire-5560:~$ sudo rfkill list all [sudo] password for mark: 0: acer-wireless: Wireless LAN Soft blocked: no Hard blocked: no 1: brcmwl-0: Wireless LAN Soft blocked: no Hard blocked: no *-network description: Ethernet interface product: NetLink BCM57785 Gigabit Ethernet PCIe vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:01:00.0 logical name: eth0 version: 10 serial: 20:6a:8a:7f:63:82 size: 10Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi msix pciexpress bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.123 duplex=full firmware=sb ip=158.65.194.244 latency=0 link=yes multicast=yes port=twisted pair speed=10Mbit/s resources: irq:16 memory:f0000000-f000ffff memory:f0010000-f001ffff memory:f0050000-f00507ff *-network description: Wireless interface product: BCM43227 802.11b/g/n vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:02:00.0 logical name: eth1 version: 00 serial: 08:ed:b9:01:e0:8b width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=5.100.82.112 latency=0 multicast=yes wireless=IEEE 802.11bgn resources: irq:18 memory:f0100000-f0103fff

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• Correcting Lighting in Stencil Reflections

  - by Reanimation

  I'm just playing around with OpenGL seeing how different methods of making shadows and reflections work. I've been following this tutorial which describes using GLUT_STENCIL's and MASK's to create a reasonable interpretation of a reflection. Following that and a bit of tweaking to get things to work, I've come up with the code below. Unfortunately, the lighting isn't correct when the reflection is created. glPushMatrix(); plane(); //draw plane that reflection appears on glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); glDepthMask(GL_FALSE); glEnable(GL_STENCIL_TEST); glStencilFunc(GL_ALWAYS, 1, 0xFFFFFFFF); glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE); plane(); //draw plane that acts as clipping area for reflection glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); glDepthMask(GL_TRUE); glStencilFunc(GL_EQUAL, 1, 0xFFFFFFFF); glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); glDisable(GL_DEPTH_TEST); glPushMatrix(); glScalef(1.0f, -1.0f, 1.0f); glTranslatef(0,2,0); glRotatef(180,0,1,0); sphere(radius, spherePos); //draw object that you want to have a reflection glPopMatrix(); glEnable(GL_DEPTH_TEST); glDisable(GL_STENCIL_TEST); sphere(radius, spherePos); //draw object that creates reflection glPopMatrix(); It looked really cool to start with, then I noticed that the light in the reflection isn't correct. I'm not sure that it's even a simple fix because effectively the reflection is also a sphere but I thought I'd ask here none-the-less. I've tried various rotations (seen above the first time the sphere is drawn) but it doesn't seem to work. I figure it needs to rotate around the Y and Z axis but that's not correct. Have I implemented the rotation wrong or is there a way to correct the lighting?

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• With the outcome of the Oracle vs Google trial, does that mean Mono is now safe from Microsoft [closed]

  - by Evan Plaice

  According to the an article on ArsTechnica the judge of the case ruled that APIs are not patent-able. He referred to the structure of modules/methods/classes/functions as being like libraries/books/chapters. To patent an API would be putting a patent on thought itself. It's the internal implementations that really matter. With that in mind, Mono (C# clone for Linux/Mac) has always been viewed tentatively because, even though C# and the CLI are ECMA standards, Microsoft holds a patent on the technology. Microsoft holds a covenant not to sue open source developers based on their patents but has maintained the ability to pull the plug on the Mono development team if they felt the project was a threat. With the recent ruling, is Mono finally out of the woods. A firm precedent has been established that patents can't be applied to APIs. From what I understand, none of the Mono implementation is copied verbatim, only the API structure and functionality. It's a topic I have been personally interested in for years now as I have spent a lot of time developing cross-platform C# libraries in MonoDevelop. I acknowledge that this is a controversial topic, if you have opinions that's what commenting is for. Try to keep the answers factual and based on established sources.

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• NHibernate Pitfalls: Cascades

  - by Ricardo Peres

  This is part of a series of posts about NHibernate Pitfalls. See the entire collection here. For entities that have associations – one-to-one, one-to-many, many-to-one or many-to-many –, NHibernate needs to know what to do with their related entities, in three particular moments: when saving, updating or deleting. In particular, there are two possible behaviors: either ignore these related entities or cascade changes to them. NHibernate allows setting the cascade behavior for each association, and the default behavior is not to cascade (ignore). The possible cascade options are: None Ignore, this is the default Save-Update If the entity is being saved or updated, also save any related entities that are either not saved or have been modified and associate these related entities to the root entity. Generally safe Delete If the entity is being deleted, also delete the related entities. This is only useful for parent-child relations Delete-Orphan Identical to Delete, with the addition that if once related entity is removed from the association – orphaned –, also delete it. Also only for parent-child All Combination of Save-Update and Delete, usually that’s what we want (for parent-child relations, of course) All-Delete-Orphan Same as All plus delete any related entities who lose their relationship In summary, Save-Update is generally what you want in most cases. As for the Delete variations, they should only be used if the related entities depend on the root entity (parent-child), so that deleting the root entity and not their related entities would result in a constraint violation on the database.

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• cannot boot Ubuntu after fresh install

  - by Jonathan

  I just installed Ubuntu on a Lenovo v570, and cannot boot into the system. All I get is a loop, where some (bios) info is displayed, and then the computer asks me where I would like to boot from. I tried reinstalling, reinstalling with a custom partition scheme, and boot -repair after the install. None of these work. I can see the files on my harddisk have been copied. I have installed many Ubuntus in the past, as well other distros where custom partitioning is required. I don't know where to find any useful information since I don't even get too the grub menu. One odd thing I noticed. The bios now had options to boot USB, OpenSuse,Fedora, or the HD. I am not dual booting. I also realized that the boot info is for a network boot, which means the computer is not recognizing what to boot. It is boot an HD problem, because I can install other OSs just fine. I am completely stumped. I would like to settle this, and end up with a tutorial, that explains to me what happened.

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• Mesh with Alpha Texture doesn't blend properly

  - by faulty

  I've followed example from various place regarding setting OutputMerger's BlendState to enable alpha/transparent texture on mesh. The setup is as follows: var transParentOp = new BlendStateDescription { SourceBlend = BlendOption.SourceAlpha, DestinationBlend = BlendOption.InverseDestinationAlpha, BlendOperation = BlendOperation.Add, SourceAlphaBlend = BlendOption.Zero, DestinationAlphaBlend = BlendOption.Zero, AlphaBlendOperation = BlendOperation.Add, }; I've made up a sample that display 3 mesh A, B and C, where each overlaps one another. They are drawn sequentially, A to C. Distance from camera where A is nearest and C is furthest. So, the expected output is that A see through and saw part of B and C. B will see through and saw part of C. But what I get was none of them see through in that order, but if I move C closer to the camera, then it will be semi transparent and see through A and B. B if move closer to camera will see A but not C. Sort of reverse. So it seems that I need to draw them in reverse order where furthest from camera is drawn first then nearest to camera is drawn last. Is it suppose to be done this way, or I can actually configure the blendstate so it works no matter in which order i draw them? Thanks

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• How to indicate to a web server the language of a resource

  - by Nik M

  I'm writing an HTTP API to a publishing server, and I want resources with representations in multiple languages. A user whose client GETs a resource which has Korean, Japanese and Trad. Chinese representations, and sends Accept-Language: en, ja;q=0.7 should get the Japanese. One resource, identified by one URI, will therefore have a number of different language representations. This seems to me like a totally orthodox use of content negotiation and multiple resource representations. But when each translator comes to provide these alternate language representations to the server, what's the correct way to instruct the server which language to store the representation under? I'm having the translators PUT the representation in its entirety to the same URI, but I can't find out how to do this elegantly. Content-Language is a response header, and none of the request headers seem to fit the bill. It seems my options are Invent a new request header Supply additional metadata in a multipart/related document Provide language as a parameter to the Content-Type of the request, like Content-Type: text/html;language=en I don't want to get into the business of extending HTTP, and I don't feel great about bundling extra metadata into the representation. Neither approach seems friendly to HTTP caches either. So option 3 seems like the best way that I can think of, but even then it's decidedly non-standard to put my own specific parameters on a very well established content type. Is there any by-the-book way of achieving this?

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• My computer may have been compromised, what should I do?

  - by InkBlend

  A few weeks ago, my machine (lets call it "main") was logged into wirelessly from an unauthorized host, probably using ssh. I did not detect the intrusion until a few days ago, and my machine is completely shut down. I found the login using this line from last: myusername pts/1 ipad Tue Oct 15 22:23 - 22:25 (00:02) Needless to say, not only does no one in my family own an iPad, but almost none of my friends do, either. This makes me suspect that whoever was behind this changed the hostname of their machine. Additionally, I discovered this line in the last output on another machine of mine ("secondary"): myusername pts/2 :0 Tue Oct 15 22:23 - 22:23 (00:00) This line coincides with the timestamp from main, which has password-less ssh access (through keys) to secondary. Is it possible that whoever broke in to main has also rooted secondary? How can I prevent this from happening again? Are there logs that I can look through to determine exactly how main was accessed (I am the only user on the system and have a very strong password)? Is it at all possible that this is just a weird bug that occurred? Should I, and where should I start looking for rootkits and/or keyloggers? In short, what should I do?

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• Player & Level class structure in 2D python console game?

  - by Markus Meskanen

  I'm trying to create a 2D console game, where I have a player who can freely move around in a level (~map, but map is a reserved keyword) and interfere with other objects. Levels construct out of multiple Blocks, such as player(s), rocks, etc. Here's the Block class: class Block(object): def __init__(self, x=0, y=0, char=' ', solid=False): self.x = x self.y = y self.char = char self.solid = solid As you see, each block has a position (x, y) and a character to represent the block when it's printed. Each block also has a solid attribute, defining whether it can overlap with other solids or not. (Two solid blocks cannot overlap) I've now created few subclasses from Block (Rock might be useless for now) class Rock(Block): def __init__(self, x=0, y=0): super(Rock, self).__init__(x, y, 'x', True) class Player(Block): def __init__(self, x=0, y=0): super(Player, self).__init__(x, y, 'i', True) def move_left(self, x=1): ... # How do I make sure Player wont overlap with rocks? self.x -= x And here's the Level class: class Level(object): def __init__(self, name='', blocks=None): self.name = name self.blocks = blocks or [] Only way I can think of is to store a Player instance into Level's attributes (self.player=Player(), or so) and then give Level a method: def player_move_left(self): for block in self.blocks: if block.x == self.player.x - 1 and block.solid: return False But this doesn't really make any sense, why have a Player class if it can't even be moved without Level? Imo. player should be moved by a method inside Player. Am I wrong at something here, if not, how could I implement such behavior?

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• Share home directory between Linux and Windows dual boot

  - by user877329

  This question is somewhat similar to How to use Windows Share has home directory, but in this case Windows is not running. I have installed a dual-boot configuration with Ubuntu 12.04 and Windows. My Windows partition is mounted on /C. Now I want either Ubuntu to locate home directories in /C/Users Which is the location of windows accounts or I want Windows to use D:\home for home directories. (D is the name of the Ubuntu root directory). For the first approach, I have managed to create a test user account test-user:x:1004:1001:Test:/C/Users/test-user:/bin/bash The account works but test-user cannot run any X session. From .xsession-errors chmod: Changing rights on ”/C/Users/test-user/.xsession-errors”: Operation not permitted Would it help get rid of that chmod, which has no effect? How do I? If I use the second approach, I need the Ext2fsd driver, which seems to work, but I am not sure if Windows maps the Ext2 system that early. Here is my fstab proc /proc proc nodev,noexec,nosuid 0 0 UUID=e7cef061-ed8d-4a82-b708-0c8f4c6f297f / ext3 errors=remount-ro 0 1 UUID=2CDCEB43DCEB0644 /C ntfs defaults,umask=007,gid=46 0 0 UUID=b087b5c0-b4bd-47e7-8d34-48ad9b192328 none swap sw 0 0 Update: I found something here: http://www.tuxera.com/community/ntfs-3g-advanced/ Will work if i do a correct mapping between NT users and Linux users.

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• Should Developers Perform All Tasks or Should They Specialize?

  - by Bob Horn

  Disclaimer: The intent of this question isn't to discern what is better for the individual developer, but for the system as a whole. I've worked in environments where small teams managed certain areas. For example, there would be a small team for every one of these functions: UI Framework code Business/application logic Database I've also worked on teams where the developers were responsible for all of these areas and more (QA, analsyt, etc...). My current environment promotes agile development (specifically scrum) and everyone has their hands in every area mentioned above. While there are pros and cons to each approach, I'd be curious to know if there are more pros and cons than I list below, and also what the generally feeling is about which approach is better. Devs Do It All Pros 1. Developers may be more well-rounded 2. Developers know more of the system Cons 1. Everyone has their hands in all areas, increasing the probability of creating less-than-optimal results in that area 2. It can take longer to do something with which you are unfamiliar (jack of all trades, master of none) Devs Specialize Pros 1. Developers can create policies and procedures for their area of expertise and more easily enforce them 2. Developers have more of a chance to become deeply knowledgeable about their specific area and make it the best it can be 3. Other developers don't cross boundaries and degrade another area Cons 1. As one colleague put it: "Why would you want to pigeon-hole yourself like that?" (Meaning some developers won't get a chance to work in certain areas.) It's easy to say how wonderful agile is, and that we should do it all, but I'm somewhat of a fan of having areas of expertise. Without that expertise, I've seen code degrade, database schemas become difficult to manage, hack UI code, etc... Let's face it, some people make careers out of doing just UI work, or just database work. It's not that easy to just fill in and do as good of a job as an expert in that area.

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• Why does my fan run so hard on my Dell XPS 15z?

  - by Kilhoffer

  I recently bought a Dell XPS 15z. It came with Windows 7 Home Premium, but I really wanted to try out Ubuntu on it. I ran the Windows installer and was surprised how smooth the process was. Within 10 minutes, I had a dual boot setup with Ubuntu 11.10. It boots into Ubuntu just fine and everything seems to work. I've read a lot about problems with touchpad and wireless, but honestly, I've had none of those issues. The only thing that's really bothering me is the fan constantly runs fast. Under Windows, it rarely ever came on and when it did, it wasnt spinning that fast. What could be going on under Ubuntu that would cause this? I want to get that under control because I want to use Ubuntu as my primary OS and screw Windows. Any help would be much appreciated! Note: I've read that others have set acpi=false, but I have not made any changes to the default installation. Should I make that change?

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