Setup: Latest Nvidia Open desktop version of Bazzite, Nvidia dGPU (screens connected), AMD iGPU (no screen connected).
Problem: Whenever anything tries to render on the iGPU with things set to Hybrid, it fails, crashes out. Wayland does try to offload things as it should but it never succeeds, & this means that I can't do anything else while a game is running, including using Plasma.
Both GPUs work fine on their own, on their own outputs (ie plugging a screen into the mobo will allow the iGPU to render on that screen) but anything sent from the iGPU to the dGPU's screens fails. I've not tried it the other way around.
Forcing vkcube onto the iGPU fails to pop the window & gives "error 7: importing the supplied dmabufs failed" though I can see that vkcube actually is running & is correctly using the iGPU, it's just not getting to the display connected to the dGPU.
Any ideas? I do not want to have to disable the iGPU entirely, nor do I really want to plug in my main monitor to the motherboard.