@Risto, I think you're seeing the same bug as Alexei in comment #44.
Have a look at
https://bugs.freedesktop.org/show_bug.cgi?id=31152
Please give the packages in the xorg-edgers/radeon PPA a try, as those
should have the fix:
https://launchpad.net/~xorg-edgers/+archive/radeon
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https://bugs.launchpad.net/bugs/557266
Title:
[needs linux-2.6.36.2] [Radeon kernel module] drmRadeonCmdBuffer: -22. Kernel
failed to parse or rejected command stream
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