FYI
Reversing the package xserver-xorg-video-ati to the version 1:6.6.3-2ubuntu6 crashes X with the same behaviour in my case.
I'm using a Mobility Radeon X700 with the default open source driver and remove the card from blacklist manually for testing.
FYI xorg-video- ati to the version 1:6.6.3-2ubuntu6 crashes X with the same behaviour in my case.
Reversing the package xserver-
I'm using a Mobility Radeon X700 with the default open source driver and remove the card from blacklist manually for testing.