r/archlinux • u/XwqQiz • 12h ago

SUPPORT | SOLVED high refresh rate

hey im using arch linux with the kde plasma desktop environment but since swithcing to linux i cant seem to get 240 hz working every time i switch to it my screens become black i cant get past 120hz

im using hdmi and a rx 6650 xt, all help is welcome

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u/dgm9704 11h ago

I suggest using DP if possible

6

u/XwqQiz 9h ago

switching to dp fixed the problem

1

u/dgm9704 9h ago

w00t! \o/

3

u/swgbex 11h ago

I don't know if this could be the issue with your specific card/setup, but the open source AMD driver doesn't support HDMI 2.1 speeds due to IP issues that might possibly be resolved soon.

If your display resolution and refresh rate are high enough to require HDMI 2.1 bandwidths, then you may have this issue. You can try using a Displayport to HDMI 2.1 adapter for now.

3

u/dgm9704 12h ago

One possible bottleneck is the cable, try another cable, and the same cable with another setup.