https://bugs.freedesktop.org/show_bug.cgi?id=43655
--- Comment #24 from Alexandre Demers alexandre.f.demers@gmail.com --- 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 is the first bad commit commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 Author: Alex Deucher alexander.deucher@amd.com Date: Wed Aug 15 17:18:42 2012 -0400
drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
- 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
:040000 040000 3e0d33c9b4eda29ced814fe9a863efe63e53f14c 4932561607b160734ec1eade927a9fe18c9f3f1b M drivers
So in other words, your explanation Alex seems to be right. I'll be waiting if anything has to be tested.