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)
Status in gdm3 package in Ubuntu:
Invalid
Status in nvidia-graphics-drivers-390 package in Ubuntu:
New
Bug description:
Lenovo ideapad 510-15IKB
OS: Ubuntu 18.04 bionic
Kernel: x86_64 Linux 4.15.0-20-generic
DE: GNOME
CPU: Intel Core i5-7200U @ 4x 3.1GHz
GPU: Intel HD 620 + NVIDIA GeForce 940MX (Optimus)
UEFI boot, Secure Boot disabled.
I installed the proprietary graphics driver with Software Properties and
Vulkan applications (e.g. vulkan-smoketest, Unreal Editor, SDK examples,
Dolphin) were working fine.
To get rid of tearing I added nvidia-drm.modeset=1 to
GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, then ran update-grub &&
update-initramfs -u and rebooted.
After doing that, Vulkan applications stopped working because they couldn't
initialize the Vulkan swap chain until I reverted the changes to GRUB.
Everything works as expected if lightdm is used instead of gdm3.
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