Downgrading libgl1-mesa-dri to version 7.5-1ubuntu1 fixes the problem.
So the regression lies with the mesa package.
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
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X server fails with DRI : drmRadeonCmdBuffer: -22
https://bugs.launchpad.net/bugs/419434
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which is the registrant for xserver-xorg-driver-ati.
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