(In reply to Christian Zigotzky from comment #0)
> [ 9.371697] lightdm-gtk-gre[2731]: unhandled signal 11 at 00000000 nip
> 6f4e61c4 lr 6f4e619c code 30001
Actually, it says right here that the crashing process is lightdm-gtk-gre, not Xorg. Please file a bug against lightdm.
(In reply to Christian Zigotzky from comment #0) gtk-gre[ 2731]: unhandled signal 11 at 00000000 nip
> [ 9.371697] lightdm-
> 6f4e61c4 lr 6f4e619c code 30001
Actually, it says right here that the crashing process is lightdm-gtk-gre, not Xorg. Please file a bug against lightdm.