https://bugs.freedesktop.org/show_bug.cgi?id=57567
--- Comment #12 from Vladimir bobahu4@gmail.com --- I found the exact commit that causes this bug
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-quantal.git;a=commit;h=8f53b544...
drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
BugLink: http://bugs.launchpad.net/bugs/1091251
commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 upstream.
- Stop the displays from accessing the FB - Block CPU access - Turn off MC client access
This should fix issues some users have seen, especially with UEFI, when changing the MC FB location that result in hangs or display corruption.
v2: fix crtc enabled check noticed by Luca Tettamanti
Signed-off-by: Alex Deucher alexander.deucher@amd.com [ herton: adjust context ] Signed-off-by: Herton Ronaldo Krzesinski herton.krzesinski@canonical.com
Hope you guys can fix it