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• Why do [flush-8:16] and [jbd2/sdb2-8] occasionally use 99.99% disk IO?

  - by ændrük

  Approximately twice a week, the entire graphical interface will lock up for about 10-20 seconds without warning while I am doing simple tasks such as browsing the web or writing a paper. When this happens, GUI elements do not respond to mouse or keyboard input, and the System Monitor applet displays 100% IOWait processor usage. Today, I finally happened to have GNOME Terminal already open when the problem started. Despite other applications such as Google Chrome, Firefox, GNOME Do, and GNOME Panel being unresponsive, the terminal was usable. I ran iotop and observed that commands named [flush-8:16] and [jbd2/sdb2-8] were alternately using 99.99% IO. What are these, and how can I prevent them from causing GUI unresponsiveness? Here is dumpe2fs /dev/sdb2, if it's relevant.

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• How can I prevent [flush-8:16] and [jbd2/sdb2-8] from causing GUI unresponsiveness?

  - by ændrük

  Approximately twice a week, the entire graphical interface will lock up for about 10-20 seconds without warning while I am doing simple tasks such as browsing the web or writing a paper. When this happens, GUI elements do not respond to mouse or keyboard input, and the System Monitor applet displays 100% IOWait processor usage. Today, I finally happened to have GNOME Terminal already open when the problem started. Despite other applications such as Google Chrome, Firefox, GNOME Do, and GNOME Panel being unresponsive, the terminal was usable. I ran iotop and observed that commands named [flush-8:16] and [jbd2/sdb2-8] were alternately using 99.99% IO. What are these, and how can I prevent them from causing GUI unresponsiveness? Details $ mount | grep ^/dev /dev/sda1 on / type ext4 (rw,noatime,discard,errors=remount-ro,commit=0) /dev/sdb2 on /home type ext4 (rw,commit=0) /dev/sda is an OCZ-VERTEX2 and /dev/sdb is a WD10EARS. Here is dumpe2fs /dev/sdb2, if it's relevant.

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• Sysadmin Nightmares – Server Room Disasters [Videos]

  - by Asian Angel

  There you are, looking at a pristine server room when disaster suddenly strikes! Whether it is fire, floods, or other causes you will feel sympathy for the sysadmins involved when watching this collection of seven server room disasters that Wired has put together. You can view the other six videos in the collection by visiting the Wired post linked below… Server Snuff: 7 Videos of a Sysadmin’s Worst Nightmares [via Fail Desk] HTG Explains: How Antivirus Software Works HTG Explains: Why Deleted Files Can Be Recovered and How You Can Prevent It HTG Explains: What Are the Sys Rq, Scroll Lock, and Pause/Break Keys on My Keyboard?

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• How to make my screen brightness not change when I plug my laptop in

  - by user63985

  I do not want my laptop to change brightness when my laptop power is plugged in or unplugged. I set my brightness based on how bright my surroundings are. If I am in a dark room, I set my brightness very low and when I plug my laptop in the brightness gets set to maximum which feels like sticking my eyes in boiling lava. In System Settings ? Brightness and Lock the Dim screen to save power checkbox is unchecked. My laptop is an HP Mini 110 In case it is an acpi issue I have put my acpi-support file here http://paste.ubuntu.com/1008244/

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• Problem on login: Freeze just before user selection

  - by Diego Garcia

  Hi, I'm using ubuntu 10.10 and when I login it shows my login's wallpaper an appears the window where I select my user without showing it and then gets frozen. No mouse response, no keyboard responde (even if I try to num/caps lock). I tried with safe mode and same thing happens, but in that case it freeze when trying to load some USB stuff, I tought it was my USB headset or my mouse so I disconnected them but doesn't works. Any advice on how to fix this, how to login to try an update or how to post more information?

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• Morning Routine Is an Alarm Clock Deactivated via Barcode Scan

  - by Jason Fitzpatrick

  Android: If you have trouble getting out of bed in the morning, Morning Routine might be just the tool you need–an alarm clock that requires you to scan a barcode to deactivate it. Similar in concept to alarm clocks which require you to solve a puzzle to shut them down, Morning Routine requires you to get out of bed and scan a barcode/QR code to turn the alarm off. If you’re worried that’s not enough you can even set it up to require a sequence of scans. In addition, you can have the scan(s) open a URL to launch your favorite news site, web radio, or other resource that serves as part of your morning routine. Morning Routine is free for a limited time, Android only. Morning Routine [via Addictive Tips] How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• The 50 Best How-To Geek Windows Articles of 2010

  - by The Geek

  Even though we cover plenty of other topics, Windows has always been a primary focus around here, and we’ve got one of the largest collections of Windows-related how-to articles anywhere. Here’s the fifty best Windows articles that we wrote in 2010. Want even more? You should make sure to check out our top 20 How-To Geek Explains topics of 2010, or the 50 Windows Registry hacks that make Windows better Latest Features How-To Geek ETC The 20 Best How-To Geek Explainer Topics for 2010 How to Disable Caps Lock Key in Windows 7 or Vista How to Use the Avira Rescue CD to Clean Your Infected PC The Complete List of iPad Tips, Tricks, and Tutorials Is Your Desktop Printer More Expensive Than Printing Services? 20 OS X Keyboard Shortcuts You Might Not Know Awesome WebGL Demo – Flight of the Navigator from Mozilla Sunrise on the Alien Desert Planet Wallpaper Add Falling Snow to Webpages with the Snowfall Extension for Opera [Browser Fun] Automatically Keep Up With the Latest Releases from Mozilla Labs in Firefox 4.0 A Look Back at 2010 Through Infographics Monitor the Weather with the Weather Forecast Extension for Opera

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• Awesome Bookmarklet Collection Ready to Select from and Add to Your Browser

  - by Asian Angel

  Bookmarklets are extremely useful additions to have for your everyday browsing needs without the hassle (or slowdown effect) of extensions. With that in mind tech blog Guiding Tech has put together a terrific collection of 21 bookmarklets that are ready to add to your favorite browser. Just scroll down and select/install the bookmarklets you like from the blog post and enjoy the enhanced browsing! You can see the beginning and end results from our sample use of the Search Site Bookmarklet in the screenshots above and below… Note: We altered the bookmarklet slightly to focus the search results through Google Singapore. How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• Optical Illusion Freezes Water In Place [Video]

  - by Jason Fitzpatrick

  This clever optical illusion uses sound frequency and a digital camera to “freeze” water in time and space. YouTube user MrBibio explains the hack: Creating the illusion of a static flow of water using sound. Of course this isn’t my idea and plenty more refined examples already exist. I tried this same experiment years ago but using a strobe light, but it’s harsh on the eyes after a while and hard to video successfully. It only dawned on me shortly before making this that for video purposes, no strobe light is required. This is because the frame rate and shutter of the camera is doing a similar job to the strobe. The speaker-as-frequency-generator model is definitely easier on the eyes than similar experiments that rely on high-speed strobes. How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• Project Kapros: A Custom-Built Workstation Featuring an In-Desk Computer

  - by Jason Fitzpatrick

  While we’ve seen our fair share of case mods, it’s infrequent we see one as polished and built-in as this custom built work station. What started as an IKEA Galant desk, ended as a stunningly executed desk-as-computer build. High gloss paint, sand-blasted plexiglass windows, custom lighting, and some quality hardware all come together in this build to yield a gorgeous setup with plenty of power and style to go around. Hit up the link below for a massive photo album build guide detailing the process from start to finish. Project Kapros: IKEA Galant PC Desk Mod [via Kotaku] How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• New Supervised Users Feature Added to Beta Channel of Google Chrome and ChromeOS

  - by Akemi Iwaya

  Are you someone who loves using Google Chrome or ChromeOS, but have been frustrated by the lack of parental controls? Then this bit of news will definitely cheer you up! Google has introduced a new supervised users feature into the beta channels of Chrome and ChromeOS that will help you lock your browser or system down and better protect your children. Screenshot courtesy of Google Chrome Blog. The process of setting up supervised user accounts is basically the same as adding additional user accounts to your browser and/or system. Once you have the new user accounts added, then log into the supervised users homepage to start managing the level of access for each new account. You can learn more about the new supervised users feature, access instructions for setting up supervised accounts, and access the supervised users homepage via the links below. A beta preview: supervised users [Google Chrome Blog] Creating Supervised User Accounts [Google Support] Chrome Supervised Users Homepage     

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• Best Free software for hosting user guides

  - by Hippyjim

  Hi All After having to clean up spam from a MediaWiki install for the umpteenth time, despite a recaptcha plugin "preventing" automated signups, I'm wondering if MediaWiki is the right choice as a CMS for hosting user manuals and guides. I've always loved the way wikis can let the guides be edited and commented on collaboratively, but I'm getting tired of dealing with automated vandals. I've disabled edits & signups for now, but as I'm having to go through the pain of cleaning thousands of junk pages, I'm beginning to think I should cut my losses and look for a better alternative. Does anyone know of suitable a FOSS application (preferably PHP / MySQL based) that would be simple for a non-coder (our manual writer) to edit, but that has all the interconnectivity, and searchability of a wiki? Or should I just bite the bullet again and lock the wiki down even further?

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• How to make "xset s off" survive a reboot (12.04)

  - by matteo

  On an almost-fresh install of Ubuntu 12.04, after disabling screen turning off, screen lock, and suspension on inactivity from all the (two) places one can find under Ubuntu's System Settings, the screen still turns black after some minutes of inactivity. I can't tell for sure whether it only becomes blank/black or turns off. I've uninstalled gnome-screensaver, which didn't change anything. Of the several answers I found out there (most of which I didn't try because they were either unclear or reported to not work for everybody), I tried one that DID work: sudo xset s off after which I left the computer unattended for hours and the screen never turned black, so it definitely worked. HOWEVER it does not survive a reboot. After reboot, screen starts turning black again after N minutes of inactivity. Given that "xset s off" does work until reboot, how do I make that setting permanent? I guess I could create a script that runs at startup issuing that command, but I think that would be a horrible hack and there should be a cleaner way to accomplish this.

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• What can I do to give some more love and disk space to my database on Ubuntu?

  - by Yaron Naveh

  I'm new to linux. I've deployed a db to ubuntu server on amazon and found out I'm low on disk space. did df (see below) - and found out that I'm 89% capacity on one file system, but less on others. What does this mean? Do I have a few partitions and can now utilize others besides /dev/xvda1? Also /dev/xvdb seems large, is it safe to put the db in it and only use it? If so do I need to mount it or do something special? $> df -lah Filesystem Size Used Avail Use% Mounted on /dev/xvda1 8.0G 6.7G 914M 89% / proc 0 0 0 - /proc sysfs 0 0 0 - /sys none 0 0 0 - /sys/fs/fuse/connections none 0 0 0 - /sys/kernel/debug none 0 0 0 - /sys/kernel/security udev 3.7G 8.0K 3.7G 1% /dev devpts 0 0 0 - /dev/pts tmpfs 1.5G 164K 1.5G 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.7G 0 3.7G 0% /run/shm /dev/xvdb 414G 199M 393G 1% /mnt

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• Lenovo Bluetooth keyboard not pairing on Ubuntu 14.04

  - by stevecoh1

  I have a brand new Lenovo Thinkpad 14.04. I also ordered a bluetooth keyboard. When I start the bluetooth app in Ubuntu, it quickly finds the keyboard. When I try to pair with it, though, it generates a number for me to type on the keyboard. I type the number, press ENTER, and yet it fails to pair. What could be the problem here? (Incidentally, after much gnashing of teeth, I inadvertently managed to completely wipe out the Windows 8.1 that came with the computer so it's all Ubuntu now.) EDIT: Hmm: I see a lock on the Bluetooth indicator. This sounds like it could be related. Not sure what to do about it. I didn't see anything about locking in the bluetooth app. I'm a bluetooth noob, by the way.

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• A better way to do concurrent programming

  - by Alex.Davies

  Programming to take advantage of multicore processors is hard. If you let multiple threads access the same memory, bad things happen. To avoid this, you use the lock keyword, but if you use that in the wrong way, your code deadlocks. It's all a nightmare. Luckily, there's a better way - Actors. They're really easy to think about. They're really safe (if you follow a couple of simple rules). And high-performance, type-safe actors are now available for .NET by using this open-source library: http://code.google.com/p/n-act/ Have a look at the site for details. I'll blog with more reasons to use actors and tips and tricks to get the best parallelism from them soon.

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• Out Of disk, but still boots

  - by LinuxPCplus

  I have a HP Compaq nx6310 notebook wth 4gb memory & a new 250gb hdd. After installing Ubuntu 12.04, i got an "out of disk" error & was unable to boot. I rebooted in live, instaled & ran Boot Repair then rebooted. Grub menu loaded fine, followed by "out of disk.....press any key to continue". I pressed a key & Ubuntu booted, a bit slow but still booted. So here are my questions: 1- Since Ubuntu DOES boot, should I just leave it alone? 2- If I need to fix this, HOW do I do it? 3- What causes this error? $wolf@lpc-1:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 230G 9.1G 209G 5% / udev 1.6G 12K 1.6G 1% /dev tmpfs 655M 868K 654M 1% /run none 5.0M 0 5.0M 0% /run/lock none 1.6G 260K 1.6G 1% /run/shm wolf@lpc-1:~$

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• How to Multitask in the Linux Terminal: 3 Ways to Use Multiple Shells at Once

  - by Chris Hoffman

  The Linux terminal has rich multitasking capabilities. You can switch between the virtual consoles already running on your system, use Bash job control to run processes in the background, and take advantage of GNU screen, a terminal “window manager.” You don’t have to stick to a single command at a time. Whether you want to run a process in the background and revisit it occasionally or run multiple time-consuming tasks at once, Linux offers several options. How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• Announcement Oracle Solaris 11.1 Availability!

  - by uwes

  On 25th of October Oracle announced the availability of Oracle Solaris 11.1. Highlights include: 8x faster database startup and shutdown and online resizing of the database SGA with a new optimized shared memory interface between the database and Oracle Solaris 11.1 Up to 20% throughput increases for Oracle Real Application Clusters by offloading lock management into the Oracle Solaris kernel Expanded support for Software Defined Networks (SDN) with Edge Virtual Bridging enhancements to maximize network resource utilization and manage bandwidth in cloud environments 4x faster Solaris Zone updates with parallel operations shorten maintenance windows New built-in memory predictor monitors application memory use and provides optimized memory page sizes and resource location to speed overall application performance. More information could be found under the following links: Oracle Solaris 11.1 Data Sheet  What's New in Oracle Solaris 11.1 Oracle Solaris 11.1 FAQs Oracle.com Oracle Solaris page Oracle Technology Network Oracle Solaris page Resources for downloading: Download Solaris 11.1 Order Solaris 11.1 media kit Existing customers can quickly and simply update using the network based repository

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• Bash script not working as required with xbindkeys

  - by RanRag

  I made a simple bash script to display a notification whenever my capslock key is pressed. It works fine when I call it like bash capsnotify.sh. The problem now is when I bind my above script to capslock key using xbindkeys tool it doesn't work as required. It shows a notification caps ON when my caps is on but it doesn't show caps OFF notification when my caps is off instead it again shows the caps ON notification. capsnotify.sh #!/bin/bash value=$(xset -q | awk '/Caps/ {print $4}') if [ "$value" == "on" ] then notify-send "caps ON" elif [ "$value" == "off" ] then notify-send "caps OFF" fi .xbindkeysrc "bash /home/ranveer/capsnotify.sh" m:0x2 + c:66 So, the problem is after binding my caps lock key on both events(on/off) it shows caps ON notification.

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• Rebind Alt key to win using setxkbmap?

  - by Wayne Werner

  Hi, After an hour or two of manpage and Google searching and finding no solution or good resources, I've come for help! I have set my Caps Lock key to Ctrl using setxkbmap -option ctrl:nocaps - this works perfectly fine. However, since I use [awesome][1], and an IBM model M which lacks the meta key, I need my left alt key to replace the windows key. Using xkeycaps I was able to get this to work, except it killed my arrow keys and End. Problematic. Unfortunately, documentation on setxkbmap options are sparse. and I can't find the proper option to use. Thanks for any links/solutions.

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• Why the Enter key in a Mac keyboard is mapped to Level?

  - by Anentropic

  Just installing Ubuntu for the first time, glad to ditch Win 7. I have a KVM switch and also a Mac, hence I'm using a Mac keyboard (the full size alu one) Everything's pretty cool. First thing I wondered is why the numeric keypad doesn't work? Oh, I have to find the num lock key (which should default to on, sensibly, no?) which isn't labelled as such on a Mac keyboard. Ok no problem. Then for some reason the Enter key on the keypad doesn't work still. Check the keyboard layout (set to 'English UK Macintosh')... inspecting the layout the Enter key is mapped to something called 'Level' - WTF is 'Level'? Everything else about the keyboard works great ie the £ $ # @ " are all perfect, volume control works as expected... why this weird key mapping on the Enter key? More importantly... how do I change it to work as an Enter key ?

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• ZeroBin Is an Encrypted PasteBin Alternative

  - by Jason Fitzpatrick

  ZeroBin is like the heavily armored sibling of PasteBin; You can still paste large chunks of text but that text is encrypted with client-side encryption. PasteBin is great when you need to share snippets of code or log files, the only problem is the service is essentially wide open. Not such a big deal if you’re sharing your XBMC logs on the support forum to get a little help figuring out why your movie list won’t update, but less than idea if you’re sharing more sensitive information. ZeroBin steps in to fill that gap by offering client-side encryption where ZeroBin has no knowledge of the content of your shared text snippets. In addition you can set up the ZeroBin content to self destruct after a set amount of time. Hit up the link below to take ZeroBin for a spin. ZeroBin [via One Thing Well] How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• Toastr Is a Simple Reminder-on-Unlock Tool for Android

  - by Jason Fitzpatrick

  Android: if you’re looking for a dead simple reminder tool, Toastr pops up a reminder when you unlock your lock screen. While there’s no shortage of calendar and reminder tools in the Android Market, most of them are overkill if all you want to set up is a simple pop-up reminder. Toastr is a free app (the premium option unlocks minor tweaks like the ability to alter the font) that allows you to set a simple pop-up notification that persists for a few seconds after you unlock your phone. Toastr [via Addictive Tips] HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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• Supertuxkart not able to start

  - by subeh.sharma

  Was working fine before i played around with NVIDIA drivers and ended up with this problem. I tried running it through the terminal and i see these messages: subsharm@subsharm-ThinkPad-T61:~$ supertuxkart Irrlicht Engine version 1.7.2 Linux 3.0.0-15-generic #25-Ubuntu SMP Mon Jan 2 17:44:42 UTC 2012 x86_64 [FileManager] Data files will be fetched from: '/usr/share/games/supertuxkart/' [IrrDriver] Creating NULL device Irrlicht Engine version 1.7.2 Linux 3.0.0-15-generic #25-Ubuntu SMP Mon Jan 2 17:44:42 UTC 2012 x86_64 [IrrDriver] Trying OpenGL rendering. [IrrDriver] Tring to create device with 32 bits Xlib: extension "GLX" missing on display ":0.0". [IrrDriver Temp Logger] Level 1: No GLX support available. OpenGL driver will not work. [IrrDriver Temp Logger] Level 2: Fatal error, could not get visual. Segmentation fault subsharm@subsharm-ThinkPad-T61:~$ sudo Xorg -configure [sudo] password for subsharm: Fatal server error: Server is already active for display 0 If this server is no longer running, remove /tmp/.X0-lock and start again.

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