https://bugzilla.kernel.org/show_bug.cgi?id=60791
--- Comment #16 from Brian Hall hallbw@gmail.com --- Cannot reproduce the problem by modifying drivers/gpu/drm/radeon/atom.c, apparently my bisect was incorrect. Problem does not occur even if I undo all the code changes for that commit.
I did reconfirm the basic problem still occurs with 3.10.5 but not 3.10.4. Will attempt to re-bisect at the next opportunity.