In case it helps... I'm too lazy to submit a new bug report, sorry...
Synopsis: For me it seems to have been the nvidia-319 driver. No hangs
since changing to nvidia-331 (over a week now).
Symptoms: X hangs, reporting 100% CPU utilization. System is
responsive, can ssh in for diagnostics.
Diagnostic Summary: Profiled system, Xorg seems to get stuck in the
nvidia drivers. See notes below for more details.
-------------------------------------------
While scrolling in Firefox.
top: Xorg 100%
operf -sgt
opreport -cg -m tgid -t20
samples % linenr info image name app name
symbol name
-------------------------------------------------------------------------------
1 33.3333 damage.c:1060 Xorg Xorg
damagePolyRectangle
1 33.3333 misprite.c:496 Xorg Xorg
miSpriteCopyWindow
1 33.3333 fbgc.c:67 libwfb.so Xorg
wfbCreateGC
2301919 53.2692 (no location information) nvidia_drv.so Xorg
/usr/lib/nvidia-319/xorg/nvidia_drv.so
2301919 100.000 (no location information) nvidia_drv.so Xorg
/usr/lib/nvidia-319/xorg/nvidia_drv.so [self]
-------------------------------------------------------------------------------
1388388 32.1290 (no location information) [vdso] (tgid:1373
range:0x7fffa3cf8000-0x7fffa3cf9fff) Xorg [vdso] (tgid:1373
range:0x7fffa3cf8000-0x7fffa3cf9fff)
1388388 100.000 (no location information) [vdso] (tgid:1373
range:0x7fffa3cf8000-0x7fffa3cf9fff) Xorg [vdso] (tgid:1373
range:0x7fffa3cf8000-0x7fffa3cf9fff) [self]
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https://bugs.launchpad.net/bugs/1184451
Title:
Ubuntu 13.10 random screen freeze while Normal OS activites
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