Looks like this is Radeon related and affects both the radeon and radeon
HD drivers.
The key issue is
drmRadeonCmdBuffer: -22
After which the X server fails. However it loads the GDM OK and will
load the xterm default succesfully.
Switching off DRI on RADEONHD and ATI allows the full gnome ses
** Summary changed:
- gnome-session fails to start
+ X server fails: drmRadeonCmdBuffer: -22
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X server fails: drmRadeonCmdBuffer: -22
https://bugs.launchpad.net/bugs/419434
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desktop