Compatibility Report

• Name of the game with compatibility issues: Doom Eternal
• Steam AppID of the game: 782330

System Information

• GPU: RTX 2060 SUPER
• Driver/LLVM version: 4.6.0 NVIDIA 440.82
• Kernel version: 5.5.6
• Link to full system information report: https://gist.github.com/Kalevr1/6f5f51d29cc2e60e370c7dda858ace34
• Proton version: 5.0-6

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

steam-782330.log.zip

Symptoms

After installing latest SteamPlay Proton 5.06 I got one perfect play session that lasted several hours. I took a break to eat and then came back to continue play. I have a 2 monitor setup. When I tried to launch the game a second time, it switched to a small window on the the secondary monitor. The lower monitor is my default screen and sits at eye level. I can see the upper left corner of the Doom Intro being rendered within the quarter-sized window on the secondary monitor. The game engine thinks it is rendering on the entire screen but I only see the portion that overlaps the window. I can see 2 buttons in the UI and I can interact with them. I Alt-F4 to exit.

Seems fixable if I can manually force the monitor and resolution for the app but I don't know if that would work. One workaround I have found is if I delete ../steamapps/compatdata/782330 the game does 'first run' again, which always runs perfectly.

I have included a screenshot of both monitors (1920x2160 pixels). Steam is fullscreen below on primary and you see the Doom Window above on the secondary.

Reproduction