I have been running my Ubuntu Linux Machine recently on powerful hardware (much more powerful than my last machine at any rate) and I have noticed that after some time all of a sudden X11 starts to behave terribly and eats a (fluxuating) average of 50% CPU usage of one of my cores. I have four cores and my computer still runs but when that begins everything from keyboard input to playing movies begins to lag and there is not way that I can get the terrible performance to stop without rebooting my computer.
The exact specifications of my computer are:
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
I am running XMonad and XMobar through my .XSession file. I like them as window managers.
I have searched around and I do not seem to be alone in this problem. Many people seem to have encountered it over the years as is listed here:
- ArchLinux Topic
- GOS Forums
- Launchpad Bug Report
This bug is particularily interesting because it shows that it is a well known problem but that people still could not find the cause.
- Another launchpad bug
- Yet another launchpad bug
- Debian Forums
- Many Ubuntu Forums Threads
I also looked into the Ubuntu X Troubleshooting guide and found this:
X CPU or memory load is high, making system laggy or freeze up. This usually indicates a client application has lost its marbles.
So if an X application has lost its Marbles then which X application is it? Well I reasoned that if the problem started and I shut down every X application then when I shut down the problem application then the problem should go away. I tried that and shut down every X application (or atleast I thought I did) and the problem still remained. Though I did not shut down XMonad because it is my window manager. I guess that it could be the problem but I would not expect it to be. Especially since it did not cause these issues on my last machine.
So my question is: what is happening and how do I fix it so that X11 stops going haywire and eating all of my CPU and behaving like a slug? Thankyou for any and all responses, I suspect that I am going to need alot of help though if I have missed out on any information then I can give you any more that you need to help me debug the problem.