Comment 15 for bug 1944389

Thank you, Srinivas! I'll try to perform the tests with the proposed configuration on the weekend.
Game: https://store.steampowered.com/app/20510/STALKER_Clear_Sky/ it costs 9.99 EUR but I'll be happy to buy it for your for the test purposes.

To run it with Steam on Linux one should enable "Steam Play" in Steam settings ("For selected titles" and "For all other titles" (I selected as compatibility tool Proton 5.0-10, but it also runs fine with the other versions)
The game graphics configuration (steamapps/common/STALKER Clear Sky/_appdata_/user.ltx) is attached. I run it on external 2560x1440 144 Hz display (USB-C=>HDMI cable)