[kde] [Bug 468904] External monitors connected to dGPU (NVIDIA) no longer working after upgrading to kde-plasma/plasma-meta-5.27.4

[Niels]

https://bugs.kde.org/show_bug.cgi?id=468904

Niels <nvaert1986 at hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |RESOLVED
         Resolution|WAITINGFORINFO              |WORKSFORME

--- Comment #4 from Niels <nvaert1986 at hotmail.com> ---
I'm running X11 and xrandr showed both of the providers and all 3 the monitors,
but KDE did not see them in the configuration pane. There it only showed 1
monitor (they were blinking in stand-by).

The output was:

xrandr --listproviders 
Providers: number : 2
Provider 0: id: 0x47 cap: 0xf, Source Output, Sink Output, Source Offload, Sink
Offload crtcs: 3 outputs: 6 associated providers: 1 name:modesetting
Provider 1: id: 0x2a1 cap: 0x2, Sink Output crtcs: 4 outputs: 7 associated
providers: 1 name:NVIDIA-G0

xrandr --listmonitors 
Monitors: 3
 0: +*DP-1-1.2 1920/518x1200/324+1920+0  DP-1-1.2
 1: +eDP-1 1920/344x1080/193+0+60  eDP-1
 2: +DP-1-1.3 1920/518x1200/324+3839+0  DP-1-1.3

I've been able to resolve the issue, by resetting my entire KDE configuration,
running the commands below (after entering a new session) and rebooting:
xrandr --setprovideroutputsource NVIDIA-G0 modesetting
xrandr --auto

The issue has been resolved for now, but seems like an issue during upgrade,
where wiping the KDE configuration resolves the issue.

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