(In reply to dwagner from comment #3)
> (In reply to Jordan L from comment #2)
> > Thanks, we can reproduce this too, should have something shortly.
> 
> Any news on this?
> 
> I am asking, because the current head of
> https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next (as of
> commit d66bebab317cc56a2a6d2438fcd89870c3d172ca) still has this very bug -
> and that is even though within "git log" I can see in commit
> 26c860d5579684528114c3875ef88f7796330eb5 there was
> > Revert "drm/amd/display: Match actual state during S3 resume."
> so I currently know of no way to make the current amd-staging-drm-next
> resume from S3 sleep.

S3 starts working since commit 95539e2be57. 

Test is performed on the following condition:
Commit: c6f284d9888
Asic: Baffin
4K display: Acer H277HK
S3 passed in 10 runs

Please verify at your side as well. Thanks.