Comment 14 for bug 1029582

This bug seems to be fixed between 3.6-rc5 snf 3.6-rc6. The most likely suspect would be:

commit f492c171a38d77fc13a8998a0721f2da50835224
Author: Christian König <email address hidden>
Date: Thu Sep 13 10:33:47 2012 +0200

    drm/radeon: make 64bit fences more robust v3

    Only increase the higher 32bits if we really detect a wrap around.

The patch mentions that this requires a different fix for 3.5 which is supposed to be submitted separately.