I use bazzite game mode (HTPC) on a HDR TV. HDR works, but I want to enhance the look of SDR games in HDR. I heard that gamescope supports ITM (inverse tone mapping) to get something similar to “auto hdr” but the global slider in steam big picture settings under graphics called “SDR Content Brightness (on HDR)” seems to overwrite everything. Has anyone gotten ITM to work?
I have
(Custom ITM settings for AppID 214490 which is the game Alien Isolation)
SCB_GAMESCOPE_ARGS+=" --hdr-itm-enable --hdr-itm-sdr-nits 100 --hdr-itm-target-nits 4000"
in .config/scopebuddy/AppID/214490.conf
but it does not seem to do anything different to the image. I do not understand how this is supposed to work with that global “SDR content brightness” slider.