Thanks.
I tried adding video_driver = "vulkan" to /storage/.config/retroarch/retroarch.cfg and creating /storage/.config/retroarch/nokms, but now I get:
Code
[WARN] Failed to bind API (#9, version 1.0) on context driver "x-egl".
[WARN] Failed to bind API (#9, version 1.0) on context driver "kms".
[WARN] Failed to bind API (#9, version 1.0) on context driver "sdl_gl".
[INFO] Vulkan dynamic library loaded.
[INFO] [Vulkan]: Detecting screen resolution 0x0.
[ERROR] [Vulkan]: Failed to enumerate physical devices.
[ERROR] [Vulkan]: Failed to create KHR_display surface.
[ERROR] [Vulkan]: Failed to set video mode.
[ERROR] [Video]: Cannot open video driver ... Exiting ...
[ERROR] Fatal error received in: "init_video()"
[ERROR] This core requires a content file, could not load content.
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Not too sure what to do with nvidia-drm.modeset=1 thing. I tried creating /storage/.config/modprobe.d/nvidia.conf and adding "options nvidia-drm modeset=1" to it, then restarting, but that had no effect.