High /usr/bin/X CPU Usage

Patrick Bégou Patrick.Begou at hmg.inpg.fr
Tue Sep 6 01:58:20 PDT 2011

Check also the fans on your graphic board. Some years ago I had a 
similar problem and the fan of my graphic board was not working.
When your computer is runing for a while, the temperature may increase 
with a fan problem on the graphic board.


Chris Robinson a écrit :
> Just an idea:
> Check the CPU temperatures.  Some people have reported problems with 
> ACPI fan control to point that it causes CPU overheating.  The 
> internal temperature sensor then reduces the clock speed to prevent 
> damage.  I've never heard of it causing this much trouble however - 
> mostly lag when watching videos etc.
> Sorry I don't have any specifics, but it might be worth eliminating 
> this as a potential problem before you go reading all that code  ;-)
> Chris
> ------------------------------------------------------------------------
> *From:* Robert Massaioli <robertmassaioli at gmail.com>
> *To:* xorg at freedesktop.org
> *Sent:* Tuesday, 6 September 2011 10:46 AM
> *Subject:* High /usr/bin/X CPU Usage
> Hi XOrg Mailing List,
> In a nutshell: I am having issues with /usr/bin/X taking up way too 
> much CPU and, when it does start to use more CPU, my entire user 
> experience becomes quite laggy. I have tried really hard to solve the 
> problem on my own but I was unable to find a solution so I have 
> finally decided that it is time for me to ask this mailing list for 
> help. That is the fundamental problem, the rest of this post deals 
> with how it happens, what I am running and what I have already tried. 
> I could use any help I can get so thank you for reading.
> This link points to a screenshot of htop running showing the constant 
> high 40-60% CPU usage that /usr/bin/X now sits at: 
> http://i.imgur.com/mRIzG.png
> My computer is quite powerful and should easily be able to handle any 
> load that any part of linux can throw at it. I have a Quad Core i2500k 
> CPU, an NVIDIA 560 Ti Graphics Card and 8GB RAM, so no hardware 
> bottlenecks thats for sure (and my Windows Partition runs like a 
> breeze; which proves that the hardware seems to be solid). However, 
> with that in mind this is what happens:
>  1. Start computer, everything is working fine, /usr/bin/X is behaving
>     normally. I can play and watch videos with no lag at all.
>  2. Wait some undefined period of time and just work on stuff (I don't
>     actually know how to reliably reproduce the problem but it does
>     happen every single time I use my linux partition).
>  3. Watch one of my CPU's spike to an average of 50% and keyboard
>     responsiveness drop to the point where I can notice the lag in
>     response time. Video playback also becomes impossibly slow at this
>     point.
> I would not have thought that the keyboard would be an issue but it is 
> lagging so I have a Razer Acosta keyboard if that helps.
> In short, I have no idea what is causing the problem, on the software 
> side I am running:
> $ uname -a
> Linux ShhnapDesk 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 
> UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
> $ cat /etc/lsb-release
> $ xmonad --version
> xmonad 0.9.2
> My window manager is XMonad as you can see from above and I am also 
> running XMobar (0.13) through that. I have tried:
>   * Asking for help elsewhere:
>     http://superuser.com/questions/328612/linux-x11-is-using-up-50-of-one-of-my-cpus-and-lagging-terribly
>   * Uninstalling Flash because I read that it might be the problem.
>   * Using Firefox instead of Google Chrome (I found that chrome had
>     some X issues in the past)
>   * Closing every single X program (bar XMonad) to see if /usr/bin/X
>     would start behaving again.
> But none of those troubleshooting attempts worked out for me.
> I do not know what else to do other than read through the entire 
> codebase of X and try and reverse engineer where my problem lies. If 
> anybody has any suggestions then please make them and any extra 
> information that you happen to require I will be more than happy to 
> provide. This problem is significantly hindering my Linux joy and I 
> love Linux. I use it for everything and have done so for the last 
> three years.
> Thanks in advance for any and all help,
> Robert
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