[Bug 104300] Kernel 4.15-rc2 on Polaris RX 480 with amdgpu.dc=1 has trouble waking up displays after suspend

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Comment # 6 on bug 104300 from
I found it! Before I knew 4.14 worked fine and 4.15+ introduced this bug.

Now I know precisely which patches:
- 4.14.35 works correctly
- 4.14.36 exhibits this behavior

There are only a few amdgpu patches in there, one by Bas Nieuwenhuizen
@chromium and a few by Alex Deucher @amd. Now I need to figure out how to set
up a kernel-building env and test which patch in particular is the one that
breaks everything.


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