There's probably no way GDM could cause this directly. But indirectly if
you are logging into a Wayland session in one case and Xorg in the
other, then that might be the main factor here.
Please try logging into both Xorg and Wayland sessions to see if one
works better.
Also, for Nvidia there used to be settings to control tearing in the
nvidia control panel. So you shouldn't need to "To get rid of tearing I
added nvidia-drm.modeset=1"...?
** Changed in: gdm3 (Ubuntu)
Status: New => Invalid
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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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