Comment # 50
on bug 56139
from Alex Deucher
(In reply to comment #49) > What if the problem is not from this code, but underneath? I'll try to > suspend and resume without having Xorg running. Would that help in any way? If the commit you bisected is actually the culprit, this is an issue with the memory controller and the displays on the GPU. When we reprogram the memory controller we need to stop all the GPU memory clients. We used to disable the display controllers but this caused additional flicker on boot up and caused hangs on some cards. So we switched to the current method which was recommended by the hardware team. This avoids the flicker by just stopping the MC interface in the displays but leaving them enabled and also fixes hangs related to this on a number of chips. Unfortunately, it seems to cause other problems in certain causes.
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