[Nouveau] commit 'drm/nv50-nvc0: request and wait on notification of modeset completion' causes suspend failures

[Maxim Levitsky]

Recently I bisected this commit, and furthermore did a manual revert.
Symptoms are very simple: black screen on resume from ram/disk in about
90% of cases.
System itself continues to function.

Also I am getting black screen on boot alarmingly often
I suspect this code to be the reason as well.


For reference I use latest (updated today) git tips of nouveau master
branch, mesa and xf86-video-nouveau.



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        Maxim Levitsky

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