[Nouveau] [Bug 94725] Nouveau driver fails to poweron GPU on GM204 after dynamic poweroff

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94725

--- Comment #6 from Alexandre Courbot <gnurou at gmail.com> ---
Maybe these messages are pointing to the root of the problem:

[   51.608479] nouveau 0000:01:00.0: Refused to change power state, currently
in D3
[   51.683924] nouveau 0000:01:00.0: Refused to change power state, currently
in D3
[   51.700020] nouveau 0000:01:00.0: Refused to change power state, currently
in D3

If the device is still in D3 when we resume it, then accessing registers would
understandably result in a freeze. Devinit comes early enough in the resume
chain to make this plausible.

FWIW I can successfully suspend/resume (echo mem >/sys/power/state) a GTX 960,
but runtime PM works slightly differently.

I would like to enable runtime PM on my desktop GTX960 to repro this, but for
some reason I am failing - despite loading nouveau with "modeset=2 runpm=1", I
cannot see runtime PM kicking in and /sys/class/drm/card0/power/runtime_status
says "unsupported". What am I doing wrong?

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