[Bug 103618] Reverse Prime with intel/amdgpu leaves Intel monitor blank

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103618

--- Comment #10 from EoD <EoD at xmw.de> ---
(In reply to Chris Wilson from comment #9)
> Created attachment 135333 [details] [review]
> Disable DPMS-deferred modesetting for GPU screens.
> 
> This should hopefully do the trick, though my memory is hazy...

This last patch makes the 2nd monitor behaviour as expected and I would
consider it fixed as long as 5. is expected.

1. On Boot AMD-monitor is active (showing boot sequence), Intel-monitor is
inactive.
2. After logging in the terminal and starting X-Server AMD-monitor stays
active, Intel-monitor stays inactive (that's new!).
3. After setting setprovideroutputsource everything stays
4. After "xrandr --output HDMI3 --auto" the 2nd monitor goes active and works
like a charm
5. After stopping X (logging off), the 2nd monitor stays enabled and only turns
itself off, if X is started again.

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