OK. Sounds like there is a device (/dev/* file) that you're not getting
correct access to. And you can only get around that limitation by
running as root (which is not recommended, for security).
In this case we may find it's an nvidia driver (or installation) bug.
Although your original observation that it's a gdm problem might
actually explain this too. I don't know if it's gdm, systemd or
something else that handles the required privilege escalation to access
/dev/GRAPHICS_THINGS so am reopening the gdm task in the hope that
somebody else knows...
** Changed in: gdm3 (Ubuntu)
Status: Invalid => New
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https://bugs.launchpad.net/bugs/1769857
Title:
Vulkan not working if nvidia-drm.modeset=1 is set and gdm3 is used
(Optimus)
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