https://bugs.kde.org/show_bug.cgi?id=433094

--- Comment #3 from Vlad Zahorodnii <vlad.zahorod...@kde.org> ---
This option was removed in 5.21 because now compositing is synchronized to
hardware vblank events and the screens are repainted as close as possible to
the next vblank. It is up to Xorg and drivers what display buffer swaps are
synchronized to.

If you have an NVIDIA video card, setting __GL_SYNC_DISPLAY_DEVICE to a 144hz
monitor should still work though.

> Is a Wayland session affected ?
On Wayland we have proper support for mixed refresh rate setups.

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