Comment # 2 on bug 60347 from Anonymous Helper

(In reply to comment #1)
> Please attach /var/log/Xorg.0.log and the output of glxinfo and dmesg.
> 
> > 3.8.0-rc5
> > Everything else taken from xorg-edgers ppa
> 
> Does the problem occur with a 3.7 kernel and/or without the PPA?

I've narrowed it down to one of these two kernel patches:

4ac0533abaec2b83a7f2c675010eedd55664bc26
cf4ccd016bae1a03bb38170eb54b5db4b04e0545