https://bugs.freedesktop.org/show_bug.cgi?id=56139
--- Comment #33 from Alexandre Demers alexandre.f.demers@gmail.com --- (In reply to comment #32)
Created attachment 70223 [details] Partial kernel.log
Here is a partial kernel.log tracking what is going on at boot with some debug printk in evergreen_mc_stop() and evergreen_mc_resume(). Strangely, only one crtc is saved as enabled in the _stop function, but four are restored in the _resume function. Pretty sure it's not the problem we are looking for, but it is abnormal since only one crtc should be restored on resume. This is a bug by itself showing a problem in the save(stop)/restore(resume) mechanism.
I should have said "... but six are restored..." instead of "... but four are restored..." I also made a small error in a debug string, but it doesn't change the read value. If you have any question on my patch, let me know.