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• Ubuntu 12.04 crashing

  - by James Mullinix

  We have a server with 2x32gb sas raid 1 and 4x1tb raid 10 + 2x1tb hot spares. Whenever we try to copy the 1tb and 1.5e6 files to a backup location (even just using tty1 cp command) it fails. We have tried using backintime and dejadup, and resorted to a manual cp to an external usb2 HDD. When that failed, we tried installing an internal HDD on the mobo (not on raid) and another cp, which also fails. The failures lock up the system and we are left with an unfortunate hard reboot situation. After reboot, syslog tends to be empty (only containing newly booted data) and we haven't a clue where to start. It has been 3 weeks since our last successful backup and we are getting nervous... -using 3ware raid controller, 8gb ram and nvidia pciexpress graphics with a gigabyte mobo and xeon 4-core processor.

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• Unity and games don't work on new Thinkpad T420

  - by Clay Smalley

  Here's my setup: Lenovo ThinkPad T420, brand new NVIDIA Graphics Card 4GB of Ram 128GB Solid State Drive Intel Core i5 Processor Given these specs, there's no reason games and Unity shouldn't be working. The strange thing is that both do work when I run from a live USB, but not when Ubuntu is installed to the hard drive. Is there something different with the 3D capabilities of running from the computer as opposed to running from the live USB? Edit: Some more information: When I log in for the first time when running from the hard drive, Ubuntu says "It seems that you do not have the hardware required to run Unity. Please choose Ubuntu Classic at the login screen and you will be using the traditional environment."

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• Connect Lenovo W520 with TV using VGA output

  - by el10780

  I am trying to connect my Lenovo Thinkpad W520 with my 32 inch TV (Samsung) using he VGA output.The problem is that after connecting it with the TV I go to System Settings and then Monitors but it doesn't show up there.I rebooted my system and again nothing happened.So I tried to change my default video card in the BIOS and I chose to boot with Intel's card only.Again though nothing happened.I didn't tried with my NVidia video card because last time I did that Ubuntu was completely destroyed after saving the configuration file through the NVidia's X Server Control Panel.My laptop has NVidia Optimus technology,but I can choose from the BIOS which video card I want to use.After running : lspci | grep VGA in terminal the results are: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (It shows only the Intel's video card because curently I have chose to boot using only Intel's video card.If I chose from the BIOS that I want to use the NVidia Optimus Technology and the option to let the system whether or not the Optimus technology is supported then both cards will show up in terminal after running lspci | grep VGA.)

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• How do I implement Unreal-like object serialization?

  - by MrWiggels

  Recently, I've been working on the core of my engine, and as I'm moving forward I find myself developing throwaway code to read files and simple data into the engine. This got me thinking about how I should implement a file management system. After a bit of googleing I came across the Unreal Package format, and boy does it look like the perfect one. I think it's good because the way how it allows you to separate different assets into different packages and allow something like a level to reference the different packages. I was just wondering, is this possible with C#? Because the built-in serialization API in .NET does not seem to support any form of this, only reading and writing to a single file.

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• How can I get my mysqld-swamped CPU under control?

  - by Shay Guy

  I was AFK for about 24 hours and came back to find gnome-system-monitor saying all four CPU cores on my laptop were running at full throttle. mysqld is taking up more than one full core; when I tried to end the process, it restarted with a new PID. Then there's ksoftirqd/0-3, which apparently has something to do with interrupts, but I can't tell from Google what I'm supposed to do with those four particular processes. They're taking up a quarter or more of my processor cycles. Then there's Chrome, but I can probably handle that on my own -- how do I cool down the other processes giving me problems?

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• HP ENVY 4-Sleekbook or Samsung Series 5 NP530U3B Ultrabook?

  - by Sam

  I am a high school student and I need a laptop within the budget of 650$. I usually have a browser, microsoft office, music, and possibly a movie or something open at once. Will the HP ENVY 4's Intel Core i3 processor be enough to handle this or would I have to get the Samsung series 5 13 inch ultrabook to get this job done? I really like the look of the HP ENVY 4, but I also want a laptop that will be quick enough to handle my needs. PLEASE HELP!

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• KVM guest disk performance

  - by Alex

  My KVM guest does max. 200MB/s although the host does easily 700MB/s (Raid 0 with 4 SSDs). Configuration: File-based storage (raw), cache none. Host 24 cores, 96GB ram, Ubuntu 12.04.1 LTS and virt-manager. I suspect the CPU to be the bottleneck (one core goes up during hdparm). Anyone experienced the same or has an explanation ? Edit: one more info: guest is the same as host (Ubuntu 12). Same poor disk performance observed with Windows 2008 R2 and Suse Enterprise Linux (9 or 10 I think). Max 1 guest running.

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• Black screen after select installing on a Dell Inspiron 14z

  - by Rodrigo

  I'm trying to do a dual boot on my Dell Inspiron 14z notebook, but I always get a black screen after selecting Install Ubuntu. I've tried to add nomodeset and acpi_osi="Linux" to the boot options, but it doesn't change anything. The hardware: 3rd Generation Intel® Core™ i7-3517U processor (4M Cache, up to 3.0 GHz) 8GB2 Dual Channel DDR3 SDRAM at 1600MHz 500GB 5400 RPM SATA HDD and 32GB mSATA SSD AMD Radeon HD7570M 1GB This question isn't duplicated. I've already tested all tips in the following question! My computer boots to a black screen, what options do I have to fix it?

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• Does XNA/MonoGame have a text caching mechanism, or has an open source one been implemented?

  - by Casey

  I'm playing around with MonoGame, and I've noticed the SpriteFont class draws static text very inefficiently. Each time the text is drawn the spacing is recalculated. This isn't a big deal on my quad core PC, but on mobile applications it might be a problem. Before I go and program some text which caches the arrangement of its letters in an array and then feeds that array to the SpriteBatch, I would like to make sure there isn't something available to do this already, either in MonoGame itself or a class someone has implemented and made available for general use.

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• HD Video Peformance Unacceptable

  - by Mike Hasselbeck

  Was wondering if anyone could help me boost HD 1080p video performance on my machine? I've got an AMD Athlon X2 Dual Core processor, 2 gb RAM & an ATI Radeon 5450 video card. I've installed the latest ATI Catalyst drivers, I installed the hardware acceleration things and linked them (I believe) to VLC. Still, it's still not running as well as I would like. Any thoughts or suggestions? Any help would be much appreciated. Thanks!

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• Continuous integration testing server: hosted, own desktop, or own server

  - by Victor

  For testing, I am planning to run a continuous integration testing. There are mainly two options: hosted, or own desktop/server. I will break it into 3 options I have: Hosted: Economical, $10-20/month for a small app Less setup, the CI company manage all hardware and software Desktop: I could just buy a simple, cheap desktop as a test server (about $500). Used server: My current office is offloading some old Dell rack server (Probably dual core Xeon, which I can purchase for $50 or less Please advise me which best serves me for a small team of 2-3 developers. Thanks.

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• You do not appear to be using the NVIDIA X driver

  - by Vishal shekhar

  my laptop has nvidia GT540m yesterday i install nvidia-current after updating fromsudo apt-add-repository ppa:ubuntu-x-swat/x-updates then i write sudo nvidia-xconfig and then reboot my desktop visual effect changes and it look good like nvidia is working but still glx i not working and nvidia-setting tells me that You do not appear to be using the NVIDIA X driver my dkms status is nvidia-current, 304.43, 3.2.0-30-generic-pae, i686: installed lspci |grep VGA output : 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M] (rev a1) also i can not login to my admin account but when i login to standard user or guest it works but still NVIDIA X driver is not working can any one suggest something so that NVIDIA X Driver start working as i seen many forum but none worked for me earlier i tried nvidia-173 ,nvidia-current(before x-swat/updates reprository) but none works for me

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• Microsoft LifeCam Audio Issue

  - by Daniel Samson

  Running Ubuntu 12.04.1 LTS 32-bit on a computer with an Intel core i5 processor, 4GB RAM and a NVIDIA 450GTS Graphics card. I am trying to set up Skype with my webcam. So far everything works almost perfectly, however my Microsoft LifeCam-VX700 v2.0 audio does not work correctly. The audio feed is just static/white noise. I have checked the hardware using windows and it worked perfectly there. The video works great in Ubuntu. It is just the audio that is the problem. What can I do to rectify this problem?

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• Best book for developer who needs to learn software fundamentals

  - by tharrison

  I have recently inherited a team of developers, none of whom really have any programming experience. Some are really bright, and are learning on their own. I am looking for one or two books that are practical but show the core practices of professional development: Structure, OO, naming, DRY, why elegance matters, etc. When I was learning, I loved Code Complete, and Programming Pearls, but they are dated now. Any recommendations for good books that could be used in tandem with a language specific book to help understand? Thanks in advance!

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• Error running phusion passenger in standalone mode

  - by msidell

  I'm trying to run standalone phusion passenger so that I can run different ruby rvm configurations on the same host. I already have ruby and passenger running fine on this host. I am following the instructions here. When I run standalone passenger the first time, it appears to successfully install nginx. But then when it tries to run, I get this error: [root@clark directra]# passenger start -a 127.0.0.1 -p 3001 -d --user dweb *** ERROR *** Could not start Passenger Nginx core: nginx: [alert] could not open error log file: open() "/tmp/passenger-standalone.16757/logs/error.log" failed (2: No such file or directory) nginx: [alert] Unable to start the Phusion Passenger watchdog (/var/lib/passenger-standalone/3.0.11-x86-ruby1.9.3-linux-gcc4.1.2-1002/support/ agents/PassengerWatchdog): Permission denied (13) (13: Permission denied) Stopping web server... done FWIW, /tmp is writeable. Any idea what's wrong?

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• fragment shader directional light positioning with camera

  - by meWantToLearn

  Im trying to set up directional lighting in the fragment shader. So the direction of my light moves with the camera position. #version 150 core uniform sampler2D diffuseTex; uniform vec4 lightColour; uniform vec3 lightDirection; vec3 LNorm = normalize(lightDirection); vec3 normal = normalize(IN.normal); vec3 calColour = lightColour[i].rgb * intensity; gl_FragColor = vec4(diffuse.rbg * calColour, diffuse.a); It lights the entire scene.

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• NorCal Weekly .Net is Up Now! Catch All for the .Net Events in Northern California!

    Ive always wanted a place that I could look through to find what .net events are going on in Northern California.  Ive found that there is a core group of people with common interested... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• JavaOne Latin America Early Bird Discount: R$300,00 Off

  - by Tori Wieldt

  Learn how to code in Java more efficiently, pick up Java best practices, and participate in world-class networking at JavaOne Latin America—all for R$300,00 less if you register by 16 November. Have you ever wondered how to construct embedded Java applications for next-generation smart devices? Want to profit from client-side solutions using JavaFX, or simply build modern applications in Java 7? Techniques for these and much more are showcased at JavaOne Latin America—and you’re invited! Choose from more than 50 sessions, multiple demos, plus keynotes and hands-on labs. Topics include: Core Java Platform JavaFX and Rich User Experiences Java EE, Web Services, and the Cloud Java ME, Java Embedded, and Java Card Secure Your Place Now—Register now! Para mais informações ou inscrição ligue para (11) 2875-4163.

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• Kernel Panic Fatal Machine Check

  - by 0x4a6f4672

  I have got a new Samsung Series 7 laptop with dual boot setup for Windows 8 and Ubuntu 12.10. The Ubuntu installation was quite a hassle, but with the help of Boot Repair finally it seemed to work. Or so I thought. Windows 8 starts fine, but if I want to start Ubuntu regularly the following error occurs, quite similar to this one [Hardware Error] CPU 1: Machine Check Exception: 5 Bank 6 [Hardware Error] RIP !inexact! 33 <00007fab2074598a> [Hardware Error] TSC 95b623464c ADDR fe400 MISC 3880000086 .. [similar messages for CPU 2,3 and 0] .. [Hardware Error] Machine Check: Processor context corrupt Kernel panic - not syncing: Fatal Machine Check Rebooting in 30 seconds Kernel panic does not sound good. Then it starts to reboot, and the second boot trial often works. Is it a Kernel or driver problem? The laptop has an Intel Core i7 processor. I already deactivated Hyperthreading in the BIOS, but it does not seem to help :-(

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• Desktop dims when Thunderbird and Firefox are launched

  - by deshmukh

  I am running Ubuntu 12.04 (almost default install regularly updated) Unity interface on ASUS X53U (AMD Brazos Dual Core C60 with 2GB RAM). On launching Thunderbird and Firefox, the application dims and the cursor changes to wait mode. In case of Thunderbird, this is most pronounced with the wait time of up to a minute. Memory status checked with free indicates around 500MB of free memory on such occasions. The OS is stable and I can switch to a different work-space, etc. What could this be? Is this something normal?

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• Integrated ads in phone apps - how to avoid wasting battery?

  - by Jarede

  Considering the PCWorld review that came out in March: Free Android Apps Packed with Ads are Major Battery Drains ...Researchers from Purdue University in collaboration with Microsoft claim that third-party advertising in free smartphone apps can be responsible for as much as 65 percent to 75 percent of an app's energy consumption... Is there a best practice for integrating advert support into mobile applications, so as to not drain user battery too much? ...When you fire up Angry Birds on your Android phone, the researchers found that the core gaming component only consumes about 18 percent of total app energy. The biggest battery suck comes from the software powering third-party ads and analytics accounting for 45 percent of total app energy, according to the study... Has anyone invoked better ways of keeping away from the "3G Tail", as the report puts it? Is it better/possible to download a large set of adverts that are cached for a few hours, and using them to populate your ad space, to avoid constant use of the Wi-Fi/3G radios? Are there any best practices for the inclusion of adverts in mobile apps?

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• How to make bash script run with a latency (i.e. wait 1 sec at each iterations)?

  - by user2413

  I have this bash script; for (( i = 1 ; i <= 160 ; i++ )); do qsub myccomputations"${i}".pbs done Basically, I would prefer if there was a 1 second delay between each iteration. The reason is that at each iterations, it sends the program file mycomputation"${i}$.pbs to a core node for solving. Solving in this instance involves the use of pseudo random numbers. I suspect the RNG I use (R's) uses CPU time as seed because as things are now I get repeating pseudo random numbers (at the rate of approx 1 out of 100). So how to you ask bash to for (( i = 1 ; i <= 160 ; i++ )); do wait 1 sec qsub myccomputations"${i}".pbs done

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• Just installed 12.04 and it freezes when I try logging in

  - by James

  I just installed Ubuntu 12.04 alongside Windows 7 on an Acer Aspire 1 with AMD Dual-Core C60, 4 GB RAM, and 320 GB HDD (100 GB partitioned for Ubuntu). After restarted my computer, I was able to log in fine but when I tried to log in again after shutting my netbook off, it began to freeze on the log in screen. The freezing occurs several seconds after I'm prompted to enter my password. Even if i enter the password before the freezing occurs, I end up getting stuck while it's loading or something. I'm new to Ubuntu so I have no idea what to do. Also, before it gets to the log in screen, it says something like this: NTFS5: No wubildr NTFS5: No wubildr NTFS5: error: "prefix" edit: it was wubildr, not unbilder. Also, the freezing seems to be inconsistent

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• Ubuntu won't boot and it is stuck on the loading screen

  - by Jordan March

  I had just installed it as dual boot 2 days ago, and everything was fine. I was installing some programs (i think it was Play On Linux) and I don't think the install was 100% done when the battery died. Since then it won't boot into Ubuntu; it just stays at the loading screen. I did make separate partitions for boot root home and swap. Can anyone help me get it back and running again? Even if I have to reinstall it. I just don't want to go back through getting all those apps. I'm running Ubuntu 12.10 64bit on a Acer Aspire 5750 core i3 cpu 4gb ram

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• HP Pavilion dv6 can't shutdown or reboot

  - by Hamza

  Ubuntu 11.04 with HP Pavilion can't shutdown or reboot. I am old linux user, been using linux for years, this is the first time in encounter this issue ever with many Linux distros on the same machine. I tried many distro but mainly Ubuntu ( 10.04 , 10.10 , 10.04 ) , the system can't reboot or shutdown with. Other than that everything works fine. Same issue happened with Linux Mint .... Well I have seen many questions with the same problem and no real answers yet, or accurate replies from Ubuntu or even HP. My Machine is : HP Pavilion dv6 , Core i7 Processor , 4 GB Rams , ATI Radeon .... etc.

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