https://wiki.ubuntu.com/X/Backtracing
http://wiki.debian.org/XStrikeForce/XserverDebugging
https://wiki.ubuntu.com/X/Troubleshooting/HighCPU
$ glxinfo | grep render
direct rendering: Yes
OpenGL renderer string: Mesa DRI Intel(R) IGD x86/MMX/SSE2
$ egrep '(loop|EE)' /var/log/Xorg.0.log
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 34.076] (II) Loading extension MIT-SCREEN-SAVER
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https://bugs.launchpad.net/bugs/1087535
Title:
[i915] [regression] Xorg excessive use of CPU (after update from lucid
to precise)
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