545 driver: desktop framerate alternates between 120 and 60 FPS

I can reproduce this on 60hz monitor - for me fluctuations happen 30/60 fps
Can be mitigated via env variables:

KWIN_TRIPLE_BUFFER=0
KWIN_X11_NO_SYNC_TO_VBLANK=1
KWIN_X11_FORCE_SOFTWARE_VSYNC=1
KWIN_X11_REFRESH_RATE=60000

here 60000 is for 60hz, OP would need 120000 probably

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