https://bugs.freedesktop.org/show_bug.cgi?id=99970

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
This could be due to a fundamental incompatibility between DRI3 and EXA (as it
is used by the radeon driver). That incompatibility is the reason for the
radeon(4) manpage saying:

 Note: DRI3 may not work correctly in all cases with EXA, enable at your own
risk.

You can try glamor, but I'm not sure it can work with your GPU.

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