resolution and refreshrate capped in KDE settings

Hi ! I just installed bazzite (kde) with the latest image.

I have a 5120x1440 240Hz display, but the highest resolution KDE offers is 3840x1080. I also only have 120Hz available.
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Solution
basically, AMD does the display protocol in the open source driver, but the hdmi forum doesn't want to allow that. therefore AMD isn't allowed to implement HDMI 2.x on linux.
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