https://bugs.kde.org/show_bug.cgi?id=499849

--- Comment #2 from Shmerl <shtetl...@gmail.com> ---
I'm using Debian testing, Wayland session.

GPU: AMD Sapphire Nitro RX 7900 XTX
Display: LG UltraGear GP27850-B (180 Hz max, adaptive sync / VRR in the 40 Hz
to 180 Hz range).

Some obvervations:

My display settings in KDE set 180 Hz which normal desktop runs at properly.

When enabling fps meter widget in system effects, it forces Application
Dashboard to run at 180 fps too and display's OSD confirms that. But without
that widget, Application Dashboard runs with erratic framerate which is
demonstrated by display's OSD fluctuating and often low refresh rate as in the
bug report (as low as 40+ Hz).

So unfortunately FPS widget actually interferes with reproducing of the problem
since I suspect it forces an extra window on top of the fullscreen one which
makes KWin run things at full desktop setting (180 fps) unlike how it handle
Application Dashboard alone.

I hope that helps, but to reproduce it you do need a display with adaptive
sync.

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