Public bug reported: We are facing an issue that GDM starts with Wayland instead of Xorg, despite of 61-gdm.rules' gdm-disable-wayland for NVIDIA graphics.
The issue happens because gdm-disable-wayland is executed after GDM has started. The reason why the udev rules takes so long is because the the runtime suspended NVIDIA GFX takes more than 1 second to runtime resume, hence the driver starts the probing routine rather late. The proper solution is to impose a barrier like systemd-udev-settle.service before GDM, but limits to the GFX device only to avoid waiting for all udev rules are finished. Since such mechanism isn't available right now, workaround the issue by enabling runtime PM after driver is bound to avoid the runtime resume delay, and hope GDM always starts after the probing is done. Please backport below patch to supported nvidia-drivers: https://github.com/tseliot/nvidia-graphics-drivers/pull/41/commits/7e9e4d4a827dc9da0e27058871034245ae4b7508 ** Affects: oem-priority Importance: Critical Assignee: jeremyszu (os369510) Status: Triaged ** Affects: nvidia-graphics-drivers-470 (Ubuntu) Importance: Undecided Status: New ** Tags: oem-priority originate-from-1942281 originate-from-1943787 stella ** Tags added: oem-priority originate-from-1942281 stella ** Tags added: originate-from-1943787 ** Changed in: oem-priority Assignee: (unassigned) => jeremyszu (os369510) ** Changed in: oem-priority Importance: Undecided => Critical ** Changed in: oem-priority Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1949026 Title: System hangs on purple screen To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1949026/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
