Hello @stixholder, we're tracking issues with games run with Proton in the Proton issue tracker. Additionally, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/569#issuecomment-913050921.
Your system information
Please describe your issue in as much detail as possible:
In Doom 3, any anti-aliasing setting other from 'disabled' will cause any 3D rendering and cutscenes to stay black. Sound is ok, HUD and crosshair is displayed, footsteps are audible when moving around (game engine obviously is running), but everything else, models, textures, motion, etc. is not rendered.
Steps for reproducing this issue: