[Nouveau] [Bug 76483] [NV50, bisected, RFC patch] xset dpms force {on, off} does not work over DP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76483

--- Comment #2 from Damien Diederen <dd at crosstwine.com> ---
Created attachment 96281
  --> https://bugs.freedesktop.org/attachment.cgi?id=96281&action=edit
[WIP,BROKEN] drm/nv50: Hack FORCE_DP_TRAIN method for DPMS  power-on

Hi Ben,

Excellent!  (FYI: I, for one, don't need any backports.)

In the meantime, I tried to kludge my way into getting the monitor to
wake up with another horrible hack (attached), but did not succeed
before running out of time.  Any idea?

I understand that both patches suffer from the race condition you were
trying to avoid in the first place, but an always on/off monitor is a
bit of a handicap :)

Alternatively/in addition, I would welcome hints on how to make Nouveau
survive power-cycling the monitor (e.g. by running a command over SSH to
reset the display).  The current behaviour is:

             [On, displaying]
                    ↓           Turn off
                  [Off]
                    ↓           Turn on
                [Booting]
                    ⋮
      [OSD: No input; shutting down]
                    ⋮
                [Standby]

Of course, feel free to suggest proper fixes, docs to read, and/or
patches to test.

Cheers, -D

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