https://bugs.freedesktop.org/show_bug.cgi?id=84627
--- Comment #19 from Michel Dänzer michel@daenzer.net --- (In reply to smoki from comment #17)
This thing starts to work (on proper 3.17 kernel) but on multiarched 64bit OS. Don't know what what is issue about on pure 32bit OS? tried with 64bit kernel there too and it was still an issues there, so this might not be radeon bug at all...
Running a 64 bit kernel is by definition not a 'pure 32 bit' OS.
So what exactly is the difference between the working and broken cases? It sounds like you're using a different distro installation in each case. Maybe there's a difference between them which isn't directly related to the graphics stack? E.g. one of them updating the CPU (not GPU!) microcode at boot, but the other one not.
(In reply to smoki from comment #18)
Is it something like - glamor 32bit bug?
Seems unlikely.