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I've read the ArchWiki: https://wiki.archlinux.org/title/Gamescope#HDR_support
It says that I have to add --hdr-enabled to enable HDR gaming on gamescope, but it never works.
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You can only do that if gamescope is your actual complete session (i.e. not start it from your DE), with a relevantly patched kernel, and with amdgpu: https://github.com/doitsujin/dxvk/releases/tag/v2.1
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Can't zen kernel do it?
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No. This is a highly experimental patch that is not part of any normal release yet.
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