SDL2 games show black screen when running in fullscreen + keeping desktop resolution.

[vanfanel]

• Sway Version:

  • swaymsg version 1.10-dev-dcdb727 (May 17 2024, branch 'master')

• Debug Log: swaylog.log

• Configuration File: config.txt

• Description: -Launch an SDL2 game, like Hydra Castle Labyrinth (https://github.com/ptitSeb/hydracastlelabyrinth) specifying fullscreen mode (-f) and keeping the desktop resolution (-d), as in: hcl -f -d -Watch the resulting black screen while the game is in fact running.

• Additional notes: -Other wlroots-based compositors don't have this issue (like labwc, where it runs fine), so it's not an wlroots problem. -Non wlroots-based compositors like Weston also don't have any problems with it.

[Nefsen402]

Sounds like an issue with direct scanout. Running sway with the environment WLR_SCENE_DISABLE_DIRECT_SCANOUT=1 will disable the feature and work around the problem. This is likely a bug with your video drivers. The last thing in the logs is direct scanout being entered right before sway is shutting down; although there are buffer allocations in between, I wonder why those are there (but those aren't going causing your bug).

[vanfanel]

Sounds like an issue with direct scanout. Running sway with the environment WLR_SCENE_DISABLE_DIRECT_SCANOUT=1 will disable the feature and work around the problem. This is likely a bug with your video drivers. The last thing in the logs is direct scanout being entered right before sway is shutting down; although there are buffer allocations in between, I wonder why those are there (but those aren't going causing your bug).

If it's my video driver (Intel, btw), why is Sway the only affected WLRoots compositor?

[vanfanel]

@Nefsen402 Also, setting WLR_SCENE_DISABLE_DIRECT_SCANOUT=1 does NOT work around the issue.

[vanfanel]

Another wlroots-based compositor where this bug is not present is Wayfire (https://github.com/WayfireWM/wayfire).