Multi windowed games issue and prefix broken on forced process termination.

[CacodemonOfDoom]

Is there an existing issue for this?

• I have searched the existing issues

Are you using any gamescope patches or a forked version of gamescope?

• The issue occurs on upstream gamescope without any modifications

Current Behavior

Greetings. I've been playing on Linux for a while now and Gamescope runs perfectly under KDE (Debian Trixie), with seemingly no performance regression (Gamescope run inside Kwin) and HDR fidelity similar to Windows. This said the only problem I'm encountering is related to multi windowed games, especially in Doom Eternal when enabling the Mod Portal beta. The game boot ups fine using Proton GE 9.22 and Experimental.

The issue comes when launching the .exe, as it will open another window inside the gamescope compositor. This causes gamescope to stall in a black screen when closing either DOOMEternalx64vk and DOOMSandBox64vk, respectively without and with no official mod support. To this extent, the other recurring problem is that gamescope utterly breaks the prefix in '~/.steam/steam/steamapps/compatdata/782330/' if I force a process end either by ALT-F4 or through the system monitor, unless I do explicitly close it through steam itself, using the stop blue button. In the case I close it by terminating the process, the prefix will break, and this means deleting the prefix in the compatdata and reinstalling the game, which then leads to a re-configuration of the whole wine prefix under protontricks.

Steps To Reproduce

1. Launch Doom Eternal with pc-mod-preview enabled in Betas.
2. Select either Proton Experimental or Proton GE (latest).
3. Launch the game.
4. Close the game through the game menu.

Hardware information

- Distro: Debian GNU/Linux trixie/sid
- CPU: 11th Gen Intel(R) Core(TM) i5-11400F @ 2.60GHz
- GPU: Advanced Micro Devices, Inc. [AMD/ATI] Navi 23 [Radeon RX 6650 XT / 6700S / 6800S] [1002:73ef] (rev c1)
- Driver Version: Mesa 24.2.8-1 (LLVM 19.1.4)
- Vulkan Version: libvulkan-dev/testing,now 1.3.296.0-1 amd64 [installed,automatic]

Software information

- Desktop environment: KDE Plasma (6.2.5)
- Session type: Wayland 1.23.0-1
- Gamescope version: gamescope/testing,now 3.15.13-2 amd64 [installed]
- Gamescope launch command(s): LD_PRELOAD="" gamescope -h 1440 -S auto --hdr-itm-enable --hdr-sdr-content-nits 418 --hdr-itm-target-nits 418 --hdr-enabled -f --adaptive-sync --hdr-debug-force-support -- %command% +com_skipintrovideo 1

Which gamescope backends have the issue you are reporting?

• Wayland (default for nested gamescope)
• DRM (default for embedded gamescope, i.e. gamescope-session)
• SDL
• OpenVR

Logging, screenshots, or anything else

No response

[matte-schwartz]

not sure but potentially the same issue as #1673