I have found out just now that if I run anything Vulkan as root (e.g. sudo vulkan-smoketest), IT WORKS! And if I then run it without sudo, IT STILL WORKS!
At this point I have no idea what is going on, nor why this doesn't affect lightdm nor sddm. It seems the affected package is indeed nvidia-graphics-drivers-390. Since it is proprietary, I'll ask in the NVIDIA Devtalk forums. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1769857 Title: Vulkan not working if nvidia-drm.modeset=1 is set and gdm3 is used (Optimus) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1769857/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
