https://bugs.freedesktop.org/show_bug.cgi?id=72051
--- Comment #6 from Alex Deucher agd5f@yahoo.com --- Actually do you have radeon.hw_i2c=1 set somewhere? If so, it should be fixed with this patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fa...