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] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1184451 Title: Ubuntu 13.10 random screen freeze while Normal OS activites To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1184451/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs