https://bugs.freedesktop.org/show_bug.cgi?id=37679

--- Comment #62 from Alex Deucher <[email protected]> 2011-10-01 11:20:46 PDT ---
Older versions of radeon kms did not support vsynced 3D which relies on vblank
interrupts in addition to sw interrupts.  You can disable it by setting the env
var vblank_mode=0.

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