Screen corruption with second monitor

[Gon Solo]

Hi!

I bought a Displayport-to-HDMI cable to connect a second monitor to my
NVIDIA 3060 12GB with three Displayport and one HDMI outputs.
The first monitor is connected via the only HDMI output.
The (second) monitor via on DP-HDMI flickers and has vertical stripes (see the
attached video). I'm running the latest Arch with Nouveau and NVK.
The first monitor is attached via 
Kernel 6.13.8-arch1-1
Mesa 25.0.2

I think it's the driver's fault because
a) console works, flickering starts with the graphical console,
b) on Windows it works,
c) with NVIDIA (nvidia-open, nvidia-utils) drivers it works,
d) booting with just the second monitor (Displayport-HDMI) works, and
e) funny enough, booting with just the second monitor, and plugging in the first one
later also works.

So my guess would be, there's something not working with Nouveau's handling of
the second screen.

I'm happy to provide more details on request.

Cheers,
Andreas

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