this post was submitted on 14 Aug 2024
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Someone made a post about enabling HDR support on Linux a day or two ago. Times have changed, and you might want to look into it again.
(I don't have HDR monitors, but it works on my OLED Steam Deck.)
The Steam Deck is an exception to the rule, unfortunately. Game mode runs using Gamescope as the compositor, which allows it to directly manage rendering surfaces and support HDR output.
Support for HDR under a regular DE is still either nonexistent or a work-in-progress last I checked.
It's been a hot minute, but they might have gotten HDR through some gamescope trickery. Sounds vaguely familiar...
KDE has experimental HDR support already