[Nouveau] [Bug 50121] [Regression] Since kernel v3.5 several cards fail to resume, introduced by: 'convert to exec engine, and improve channel sync'

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=50121

--- Comment #33 from Ronald <ronald645 at gmail.com> ---
The FX5200 still functions and survived another cycle.

I went ahead and tested your patch on a 'G73 (NV4B)' as well. Since modeset
became mandatory suspend/resume never worked (anymore). It suspended, but
resumed with a garbled console where some colors are off. Eventually, the card
looks up.

Recent rework made the screen completely black. So the regression regressed
even further. Current head with your patch restores the second regression back
to where the display is garbled after resume (after which it looks up again).

So I'm fairly confident that your patch restores pre rework (v3.5) behaviour on
these cards with respect to suspend and resume cycles.

I'm going to test an NV4E laptop later, when I have time.

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