https://bugzilla.kernel.org/show_bug.cgi?id=47321
--- Comment #5 from Alex Deucher alexdeucher@gmail.com 2012-09-10 20:19:20 --- Also possibly related: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=... or: http://lists.freedesktop.org/archives/dri-devel/2012-September/027545.html