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• Why won't USB 3.0 external hard drive run at USB 3.0 speeds?

  - by jgottula

  I recently purchased a PCI Express x1 USB 3.0 controller card (containing the NEC USB 3.0 controller) with the intent of using a USB 3.0 external hard drive with my Linux box. I installed the card in an empty PCIe slot on my motherboard, connected the card to a power cable, strung a USB 3.0 cable between one of the new ports and my external HDD, and connected the HDD to a wall socket for power. Booting the system, the drive works 100% as intended, with the one exception of throughput: rather than using SuperSpeed 4.8 Gbps connectivity, it seems to be falling back to High Speed 480 Mbps USB 2.0-style throughput. Disk Utility shows it as a 480 Mbps device, and running a couple Disk Utility and dd benchmarks confirms that the drive fails to exceed ~40 MB/s (the approximate limit of USB 2.0), despite it being an SSD capable of far more than that. When I connect my USB 3.0 HDD, dmesg shows this: [ 3923.280018] usb 3-2: new high speed USB device using ehci_hcd and address 6 where I would expect to find this: [ 3923.280018] usb 3-2: new SuperSpeed USB device using xhci_hcd and address 6 My system was running on kernel 2.6.35-25-generic at the time. Then, I stumbled upon this forum thread by an individual who found that a bug, which was present in kernels prior to 2.6.37-rc5, could be the culprit for this type of problem. Consequently, I installed the 2.6.37-generic mainline Ubuntu kernel to determine if the problem would go away. It didn't, so I tried 2.6.38-rc3-generic, and even the 2.6.38 nightly from 2010.02.01, to no avail. In short, I'm trying to determine why, with USB 3.0 support in the kernel, my USB 3.0 drive fails to run at full SuperSpeed throughput. See the comments under this question for additional details. Output that might be relevant to the problem (when booting from 2.6.38-rc3): Relevant lines from dmesg: [ 19.589491] xhci_hcd 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17 [ 19.589512] xhci_hcd 0000:03:00.0: setting latency timer to 64 [ 19.589516] xhci_hcd 0000:03:00.0: xHCI Host Controller [ 19.589623] xhci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 12 [ 19.650492] xhci_hcd 0000:03:00.0: irq 17, io mem 0xf8100000 [ 19.650556] xhci_hcd 0000:03:00.0: irq 47 for MSI/MSI-X [ 19.650560] xhci_hcd 0000:03:00.0: irq 48 for MSI/MSI-X [ 19.650563] xhci_hcd 0000:03:00.0: irq 49 for MSI/MSI-X [ 19.653946] xHCI xhci_add_endpoint called for root hub [ 19.653948] xHCI xhci_check_bandwidth called for root hub Relevant section of sudo lspci -v: 03:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30) Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at f8100000 (64-bit, non-prefetchable) [size=8K] Capabilities: [50] Power Management version 3 Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+ Capabilities: [90] MSI-X: Enable+ Count=8 Masked- Capabilities: [a0] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Device Serial Number ff-ff-ff-ff-ff-ff-ff-ff Capabilities: [150] #18 Kernel driver in use: xhci_hcd Kernel modules: xhci-hcd Relevant section of sudo lsusb -v: Bus 012 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 bDeviceClass 9 Hub bDeviceSubClass 0 Unused bDeviceProtocol 3 bMaxPacketSize0 9 idVendor 0x1d6b Linux Foundation idProduct 0x0003 3.0 root hub bcdDevice 2.06 iManufacturer 3 Linux 2.6.38-020638rc3-generic xhci_hcd iProduct 2 xHCI Host Controller iSerial 1 0000:03:00.0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 25 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xe0 Self Powered Remote Wakeup MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 Unused bInterfaceProtocol 0 Full speed (or root) hub iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0004 1x 4 bytes bInterval 12 Hub Descriptor: bLength 9 bDescriptorType 41 nNbrPorts 4 wHubCharacteristic 0x0009 Per-port power switching Per-port overcurrent protection TT think time 8 FS bits bPwrOn2PwrGood 10 * 2 milli seconds bHubContrCurrent 0 milli Ampere DeviceRemovable 0x00 PortPwrCtrlMask 0xff Hub Port Status: Port 1: 0000.0100 power Port 2: 0000.0100 power Port 3: 0000.0100 power Port 4: 0000.0100 power Device Status: 0x0003 Self Powered Remote Wakeup Enabled Full, non-verbose lsusb: Bus 012 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 011 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 010 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 009 Device 003: ID 04d9:0702 Holtek Semiconductor, Inc. Bus 009 Device 002: ID 046d:c068 Logitech, Inc. G500 Laser Mouse Bus 009 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 006: ID 174c:5106 ASMedia Technology Inc. Bus 003 Device 004: ID 0bda:0151 Realtek Semiconductor Corp. Mass Storage Device (Multicard Reader) Bus 003 Device 002: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 006: ID 1687:0163 Kingmax Digital Inc. Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 046d:081b Logitech, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Full output: full dmesg full lspci full lsusb

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• Can I make a bootable USB flash drive for Mac from Windows

  - by Patrick

  Problem: MacBook hard drive crashed and is ruined. I need to work on a music assignment on a program only available for Mac OS X and Ubuntu, and will not be able to get a new hard drive for the Mac before the assignment is due. I only have non-administrator access to Windows XP and 7 computers. Can I make a USB drive with Ubuntu on it so I can use my MacBook with this? Can I create this from a Windows computer? Please give detailed steps, if possible, for I am a noob when it comes to computers, and especially Linux.

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• Les ventes de smartphones sous Android dépassent celles de l'iPhone pour la première fois aux États-

  Mise à jour du 11/05/10 Les ventes de smartphones sous Android dépassent celles de l'iPhone Pour la première fois aux États-Unis, selon une étude de NPD Les ventes de mobiles embarquant Android, l'OS de Google, viennent de dépasser pour la première fois celles de l'iPhone sur le marché américain. C'est ce que révèle une étude de NPD qui attribue une part de marché de 26 % à Android contre 21 % à l'iPhone. Petite nuance cependant, ces chiffres sont « déclaratifs », autrement dit ils s'appuient sur les retours des usagers et non sur les chiffres de vente des différents opérateurs. Autre bémol, ils ne prennent pas en comp...

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• What makes an application memory bandwidth bound?

  - by TheLQ

  This has been something that's been bothering me for a while: What makes an application memory bandwidth bound? For example, take this monstrosity of a computer that calculated the 5 trillionth digit of pi (and later 10 trillionth digit). I was surprised that they choose the lower but faster 98 GB RAM at 1066 MHz instead of the larger but slower 144 GB at 800 MHz. This is especially surprising considering they are using 22 TB HD array to store the results from computation; more RAM means less need for hard drives. Maybe its because I don't write applications for HPC servers, but how would RAM be the bottleneck? Are there any other non-HPC applications that usually run into this problem?

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• Setup suspend-on-lid-close/Fn+F4 outside of KDE/Gnome?

  - by maxschlepzig

  On current Ubuntu (10.04) suspend-on-lid/Fn+F4 only works if some powermanagement-applet of KDE/gnome is running. But what about suspend-to-lid if you are working on the console or using a non-bloated window-manager? What is the current mechanism to configure suspend-on-lid system wide? What of hald/udev/acpid/foo-kit/random-thing is the right place to hook this feature in? What is the up-to-date command to suspend from the command line/script? echo -n mem > /sys/power/state pm-suspend pmi or something else? Btw, if it matters, I want to configure it on some Thinkpads.

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• From Imperative to Functional Programming

  - by user66569

  As an Electronic Engineer, my programming experience started with Assembly and continue with PL/M, C, C++, Delphi, Java, C# among others (imperative programming is in my blood). I'm interested in add to my previous knowledge, skills about functional programming, but all I've seen until now seems very obfuscated and esoteric. Can you please answer me these questions? 1) What is the mainstream functional programming language today (I don't want to get lost myself studying a plethora of FP languages, just because language X has the feature Y)? 2) What was the first FP language (the Fortran of functional programming if you want)? 3) Finally, when talking about pure vs. non pure FP what are the mainstream languages of each category? Thank you in advance

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• How can i get almost pixel perfect collision detection in a multiplayer game?

  - by Freddy

  I'm currently working on a multiplayer game for iPhone. The problem i have, as with all multiplayer games, is that the other user will always see everything at a non-constant delay. The game I'm making need to have a almost pixel perfect collision detection, but 1 or 2 pixels off is not that big of a deal. How can I possibly get this working? I guess I could just set local player to also be at X ms delay. However this will probably just be worse and feel sloppy when the user input. I know this problem is probably something network programmers deal with everyday and I would be glad if someone could give me a possible solution for this.

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• How do I change my 1080p external monitor from portrait to landscape on an Eee PC 1000H?

  - by Acky

  Hi I have an EeePC 1000H netbook with a Samsung T22A350 1080p 22" external monitor. I've just installed Ubuntu 12.04 and I mainly use the external display but when I select 1080 from the dropdown list, my only options are for a rotated portrait. My neck's non too supple, so tilting my head for extended periods is not really viable. :-) Any ideas on making ubuntu display 1080 normal landscape? It must be possible as using a gparted boot cd does it perfectly. Any help greatly appreciated. Cheers!

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• Rendez vous des Experts : Introduction à Ruby On Rails, une émission avec Developpez.com pour tout savoir sur le framework Web

  Rendez vous des Experts : Introduction à Ruby On Rails Une émission en partenariat avec Developpez.com pour tout savoir sur le framework Web Ruby On Rails n'est pas spécialement la technologie Web la plus connue. Pour faire simple, « Ruby » est le langage et « On Rails » est le framework qui vient s'y ajouter pour l'adapter aux développements Web. Le résultat est un outil assez récent (Ruby est en version 1.9.2, Rails quant à lui approche la version 3.1), interprété (et non pas compilé), utilisable aussi bien sur des EDI comme Eclispe ou Netbeans que dans un simple éditeur de texte. Le Rendez-vous des Experts et Julien Dollon , avec lesquels D...

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• Pendrive USB Ubuntu installation - black screen on boot

  - by ubuntico

  I see many posts on this, but no solution. I installed Ubuntu 12.04 on my 16GB USB flash drive using this official link using their tool Universal USB Installer. Installation to USB went fine so I set my laptop to boot from USB and the Ubuntu was recognized. I saw the usual boot screen and I chose option "Run Ubuntu from this USB". The boot process started and after 5-6 seconds the screen goes black and non-responsive. I thought that it hang on X loading so I tried switching to console via Ctrl+Alt+F1-6 but the system did not respond. Why is this happening? Am I doing something wrong? PS. My laptop is HP Pavillion G6

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• Is it possible to have .bashrc outside home directory?

  - by FSchmidt

  I want to put a .bashrc file in a directory where my application is located, to set up path variables accordingly independent of the location of the directory at the moment. At the same time, I want to be able to run the application right away, without having to source a shell file to set the path every time. Therefore I figured I could use .bashrc which is executed when the non-login terminal is started. If I do put it in the proper .bashrc in the home directory, I would have to give an absolute path which I want to avoid. Is there a way to have something like .bashrc but not in home directory (ie a shell that is executed when terminal is started?)

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• Ouverture officielle du forum d'entraide sur la programmation des systèmes embarqués

  Nous avons le plaisir de vous annoncer la création du forum programmation système embarqué. Le but de ce forum est de regrouper les sujets liés à l'embarqué et aux problématiques bas niveau. Il s'agit donc globalement de la frontière logiciel / matériel pour laquelle il est bien souvent difficile de savoir où poser sa question sur DVP. Voici donc une liste non exhaustive de sujets que nous pouvons traiter : Développement sur microcontrôleurs (PIC, ATMEL, Arduino, ...) (MPLAB - AVR-GCC / AVR Dude) Développement sur processeurs ARM, Intel, MIPS, Power PC, ... Développement sur DSP Développement sur FPGA / VHDL Utilisation de cartes de développement ARM (Beagle Board, Fox Board, Panda Board, ...) Développement Linux e...

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• Is it possible to mod_rewrite BASED on the existence of a file/directory and uniqueID?

  - by JM4

  My site currently forces all non www. pages to use www. Ultimately, I am able to handle all unique subdomains and parse correctly but I am trying to achieve the following: (ideally with mod_rewrite): when a consumer visits www.site.com/john4, the server processes that request as: www.site.com?Agent=john4 Our requirements are: The URL should continue to show www.site.com/john4 even though it was redirected to www.site.com?index.php?Agent=john4 If a file (of any extension OR a directory) exists with the name, the entire process stops an it tries to pull that file instead: for example: www.site.com/file would pull up (www.site.com/file.php if file.php existed on the server. www.site.com/pages would go to www.site.com/pages/index.php if the pages directory exists). Thank you ahead of time. I am completely at a crapshot right now.

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• Rendering transparent textures in directX

  - by Vibhore Tanwer

  I am working with a directX application with WPF, I am facing a problem with videos and images that contains transparent pixels, I have to draw a color in background an then a video/image over it. What I expect is background color should be visible while playing video only non transparent pixels should be visible but what I get is a black background behind the video. I am using following settings on device to achieve alpha blending : device.RenderState.SourceBlend = Blend.SourceAlpha; device.RenderState.DestinationBlend = Blend.InvSourceAlpha; device.RenderState.AlphaBlendEnable = true; What am I missing here? What is the best approach to handle transparent videos? Any help will be of great value to me.

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• Removal of the JDBC-ODBC Bridge from Java SE 8 JDK

  - by user12629431

  Starting with Java SE 8, the JDBC-ODBC Bridge will no longer be included with the JDK. The JDBC-ODBC Bridge has always been considered transitional and a non-supported product[1] that was only provided with select JDK bundles and not included with the JRE. The JDBC-ODBC bridge provides limited support for JDBC 2.0 and does not support more recent versions of the JDBC specification. I would recommend that you use a JDBC driver provided by the vendor of your database or a commercial JDBC Driver instead of the JDBC-ODBC Bridge. [1]http://docs.oracle.com/javase/7/docs/technotes/guides/jdbc/bridge.html.

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• Juju LXC configuration

  - by Preethi

  I've looked at this post (http://askubuntu.com/questions/65359/how-do-i-configure-juju-for-local-usage) for setting up juju on a local environment with lxc. However, is there a way to use juju with lxc in a non-local environment? I am looking at a scenario where lxc containers are deployed on multiple nodes. I.e., lets say I have virtual machines m1 and m2 with wordpress deployed on a container in m1 and mysql deployed on a container in m2. Is there a way to orchestrate these deployments with juju?

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• Recovery from hell - undeleting partition overwritten by Xubuntu 12.10 installer?

  - by DaimyoKirby

  This is turning into a nightmare - following my initial recovery of my two partitions, I went to install Xubuntu 12.10 (again). At this time I had two partitions - one of ~39 GB had Zorin OS 6 installed on it, and another of ~33 GB had nothing installed, just a few files in it that I had manually backed up (moved) there. When I got to the partitioning step, I chose "Replace Zorin OS 6 with Xubuntu 12.10", along with LVM, naturally thinking that the installer wouldn't touch the second partition, since Zorin wasn't installed on it. I was dead wrong. Upon booting my newly installed Xubuntu 12.10, I found in gparted that there were only two partitions - ~255MB, which appears to have the boot stuff in it (it's flagged boot in gparted), and another of ~74 GB. Question: Is there any way to salvage my old files on the non-Zorin ext3 partition? I'm really upset I made such a dumb move (again...), and any and all help is appreciated very, very much!

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• how to convince other we should move to hadoop?

  - by Ramy

  Everything I've read about Hadoop seems like exactly the technology we need to make our enterprise more scalable. We have terabytes of raw data that is in non-relational form (text files of some kind). We're quickly approaching the upper limits of what our centralized file server can handle and everyone is aware of this. Most people on the tech team, especially the more junior members of the tech team are all in favor of moving from the central file system to HDFS. The problem is, there is one key (most senior, etc.) member of the team who is resisting this change and every time Hadoop comes up, he tells us that we could simply add another file server and be in the clear. So, my question (and yes, it's really subjective, but I need more help with this than any of my other questions) is what steps can we take to get upper management to move forward with Hadoop despite the hesitation of one member of the team?

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• XNA: Runtime differences in ClickOnce install versus development version

  - by Sean Colombo

  I have a game written in XNA, and I use ClickOnce installers to distribute the game to testers. I keep once computer as a test machine which does NOT have development environments installed, so that I can test the installed version. We've found a reproducible bug in our game, but the bug ONLY occurs on the non-development machines that use the ClickOnce installer. The bug is related to some of our code for moving around 3D objects and is not tied to Networking or GamerServices. Are there known differences in the ClickOnce runtime and the version on dev? Are there any best-practices for debugging something like this?

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• Library search paths

  - by David Clements

  This question originally started in an apparent problem in Cups calling various back-ends and using non-standard library search paths. If I want to change a library search path for a app running in a terminal I can use LD_LIBRARY_PATH, RPATH, etc., but if I want to change a library path for a Cups back end, I subsequently resolved the Cups issue, but I don't see any mechanism to change the search path whare an app is not running in terminal. For example Cups calls backendA and backendB to print on 2 printers, BackendA uses libxxx.1.15 and BackendB needs libxxx.1.05, is there any way to change the library search path for backendB (only) without recompiling backendB, (I may not have the source)? Any ideas?

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• RPG Item processing

  - by f00b4r

  I started working on an item system for my (first) game, and I'm having a problem conceptualizing how it should work. Since Items can produce a bunch of potentially non-standard actions (revive a character vs increasing some stat) or have use restrictions (can only revive if a character is dead). For obvious reasons, I don't want to create a new Item class for every item type. What is the best way to handle this? Should I make a handful of item types (field modifiers, status modifiers, )? Is it normal to script item usage? Could (should?) this be combined with the above mentioned solution (have a couple of different sub item types, make special case items usage scripted)? Thanks.

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• Windows: starting sqlplus in new window from cygwin bash

  - by katsumii

  When I start sqlplus, more often than not, I want it to start in new window,whether it be on Linux/Solaris GNOME or Windows.I seldom use GNOME so I never bothered to figure out how.On Windows, one can use Windows menu or Win+R "Run" dialog but I prefer usingbash. Because, this way, I can keep the history in ~/.bash_history file.There are 2 ways. Using cmd.exe or cygstart.For example, to start default sqlplus.exe to connect to default local instance. $ cmd /c "start sqlplus sys/oracle as sysdba" 2nd example. To start sqlplus in 2nd Oracle home and to connect to non-default local instance. $ ORACLE_SID=orcl cygstart /cygdrive/g/app/product/11.2.0.3/dbhome_1/BIN/sqlplus scott I hope this tip helps reducing your DBA time.

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• HTG Explains: Live File System vs. Mastered Disc Formats in Windows

  - by Chris Hoffman

  When burning a CD or DVD with Windows, you’ll be asked whether you want to use a Live File System or a Mastered disc format. Each has its own advantages and disadvantages. Windows 7 refers to this as “Like a USB flash drive” or “With a CD/DVD player.” But how exactly can a non-rewritable disc function like a USB flash drive? HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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• How to install again Update Manager after uninstalling it

  - by biezdar

  Ok, the thing is this I tried asking many times on few ubuntu forums how to deal with my non-responsive Update Manager, but all I was getting was the same stuff (run it from the terminal, run some lines, apt-get update blah blah). Nothing was helping. Eventually I went mad Windows style and tried to simply uninstall it and install it again. The problem is - how to install it again? Can't do it through Software Center, can't really build a package (because I'm too stupid to do that). And I seriously want to avoid reinstalling the whole system. I am running a 12.04 verison (Update Manager was unable to update to a newer one) Please help. I am furious with this thing.

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• How can I set up a keyboard shortcut so that Ctrl+Backspace = Del?

  - by Palantir

  As an old mac user, I am used to hitting Ctrl+Backspace, and the effect is the same as if I pressed Del. I have recently purchased an Asus N53SV laptop which has replaced my MacBook, but unfortunately this laptop has a very annoying keyboard layout, where the Del key is in a non standard position, and moreover it is TINY. Is it possible to get the Ctrl+Backspace combination to issue a Del and how would I do this? Using Kubuntu, but I believe this is to be done at X level, not at desktop, am I right? Thanks!

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