Comment 110 for bug 1167624

Well, I experienced the crashes without attaching secondary monitor and there were no X errors in logs in my so i thinks it's not related to X server.

You can reduce laptop resolution this way (to 1600x900):

    # gtf 1600 900 60
   xrandr --newmode "1600x900" 119.00 1600 1696 1864 2128 900 901 904 932 -HSync +Vsync
   xrandr --addmode eDP1 1600x900
   xrandr --output eDP1 --mode 1600x900

But this solution is not permanent.

Anyway, currently testing kernel:

3.5.0-36-generic #57~precise1-Ubuntu SMP Thu Jun 20 18:21:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

No crashes for over a week.