KMSDRM not working mainline git

[praxis88]

Describe the bug
The KMSDRM driver is claimed to be not available by SDL_INIT, the master sharing seems to be not working.

Steps to reproduce
Build off git
QT_SCALE_FACTOR=2 VULKAN_IS_SLOW=1 GL_IS_SLOW=1 moonlight

Affected games
all streaming with kmsdrm

Other Moonlight clients
I dont know, I dont git build for android or ios.

Moonlight settings (please complete the following information)
50mbps 1440p h265 (hdr/nohdr doesnt matter)

Client PC details (please complete the following information)

• OS: Arch
• Moonlight Version: git
• GPU: Intel-media-driver(iHD) - Intel Corporation Alder Lake-N [UHD Graphics]

Server PC details (please complete the following information)

• OS: Windows 11
• Sunshine or GeForce Experience version: Sunshine
• GPU: AMD
• GPU driver: 26.1.1

Moonlight Logs (please attach)
00:00:00 - SDL Error (0): Failed to restore master to Qt DRM FD: 16
00:00:00 - SDL Error (0): Failed to restore CRTC state to Qt DRM FD: 13
00:00:17 - SDL Error (0): SDL_InitSubSystem(SDL_INIT_VIDEO) failed: kmsdrm not available

moonlight.txt

Additional context
This is regressed, when we did the overhaul for HDR and master sharing approx a month ago, this wasn't happening, and i was using arch then as well

Fwiw this is not a problem after loading it up on debian, but if it's broke in arch, it will probably be broken in debian "shortly"

[frysztak]

I also experience that issue, but on Debian 13. there's a workaround however: if I restart Moonlight app and quickly start streaming, it works 🤷

[itzikscreenovate]

Any workaround for this one? Having a similar issue with rpi5.

When starting the stream initially - works. When pausing - resuming. SDL_InitSubSystem(SDL_INIT_VIDEO) failed: kmsdrm not available.

Something about drmmaster sharing maybe? Handoff with the ui?