https://bugzilla.kernel.org/show_bug.cgi?id=47481
--- Comment #8 from Alex Deucher alexdeucher@gmail.com 2012-09-18 17:00:44 --- The commit is: drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
As of right now, it's here: http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-3.7-wip&id=2... but I rebase that branch regularly so it may change.