Emulator

What's the problem? Describe what went wrong.

No game can be started when the 30bpp mode in enabled for Xorg on Linux. I only get the following warning windows:
“Failed to find a suitable format for swap chain buffers.” [OK] [Ignore for this session]
Clicking on [OK]: “Failed to create Vulkan swap chain.” [OK] [Ignore for this session]
Clicking on [OK]: “FIFO shutting down while active” [OK] [Ignore for this session]
Clicking on [OK]: “Failed to initialize video backend!” [OK] [Ignore for this session]

Note:

• I have no such issue when using the Vulkan renderer of other emulators such as PCSX2, PPSSPP and DuckStation.
• Games start without issues when Xorg runs in 24bpp mode.
• I'm using the RADV driver on Gentoo.
• At least Mesa 22.0.0 (or a patched version) should be needed to fully reproduce the issue. See: https://docs.mesa3d.org/relnotes/22.0.0.html (“wsi/x11: support depth 30 visuals”), https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9450

What steps will reproduce the problem?

1. Run Xorg in 30bpp mode (with Mesa >= 22.0.0) on hardware that supports it: https://wiki.gentoo.org/wiki/30bpp
2. Start the emulator and in “Graphics” → “Backend” make sure «Vulkan» is selected (this is the renderer I'm using).
3. Try to start any game.

Is the issue present in the latest development version? For future reference, please also write down the version number of the latest development version.

Yes: Dolphin [HEAD] 5.0-16195