https://bugs.kde.org/show_bug.cgi?id=357988

--- Comment #8 from Thomas Lübking <thomas.luebk...@gmail.com> ---
Sum up:
- kwin has a proper idea of the screen geometries
- not even restarting the compositor (complete rebuild of GL context) "fixes"
it
- switching framebuffers (VT2 and back) works

Smells a lot like an X11 driver issue (which only paints the cursor into the
framebuffer, but not actual X11)

- What's the state when just suspending the compositor - is the screen black as
well?
- What if you even "kwin_x11 --replace &"
- Does this affect all screens or only the displayport one?

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