https://bugs.kde.org/show_bug.cgi?id=365455

--- Comment #32 from Martin Gräßlin <mgraess...@kde.org> ---
> qdbus org.kde.KWin /KWin supportInformation after failed attempt

it has two screens shown correctly so from xrandr information it looks correct.

Just sharing something I observed this morning on Wayland: a page flip failed
turning one screen off. I waited for power management setting both screens into
dpms mode, then moved the mouse to exit dpms and look there, both screens are
on again.

Which brings me to a theory: maybe the modesetting fails on the screen and
that's why it goes off? Can you have a look into the xorg log and into dmesg
whether there are any messages related to that?

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