The slow boots seem to be due to the Nvidia kernel driver interfering in backlight control, which might also be a kernel bug:
Feb 28 14:13:24 alvin-Legion-Pro-7-16IRX8H systemd-udevd[515]: 0000:00:02.0: Worker [560] processing SEQNUM=4649 is taking a long time Feb 28 14:13:56 alvin-Legion-Pro-7-16IRX8H systemd[1]: systemd-backlight@backlight:nvidia_0.service: start operation timed out. Terminating. Feb 28 14:13:56 alvin-Legion-Pro-7-16IRX8H systemd[1]: systemd-backlight@backlight:nvidia_0.service: Main process exited, code=killed, status=15/TERM Feb 28 14:13:56 alvin-Legion-Pro-7-16IRX8H systemd[1]: systemd-backlight@backlight:nvidia_0.service: Failed with result 'timeout'. Feb 28 14:13:56 alvin-Legion-Pro-7-16IRX8H systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0. Feb 28 14:13:57 alvin-Legion-Pro-7-16IRX8H systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:nvidia_0... Feb 28 14:13:57 alvin-Legion-Pro-7-16IRX8H systemd[1]: Finished Load/Save Screen Backlight Brightness of backlight:nvidia_0. The failed boots are some kind of failure to start gdm, although in one case there was also an Nvidia kernel driver crash. Please check for crashes in /var/crash and if found then report them using the ubuntu-bug command. If not found then please enable the debug section in /etc/gdm3/custom.conf, reboot and collect more logs from failed boots. ** Also affects: linux-hwe-6.5 (Ubuntu) Importance: Undecided Status: New ** Summary changed: - Boots slowly or not at all when NVIDIA driver is installed + [Lenovo Legion Pro 7 16IRX8H] Boots slowly or not at all when NVIDIA driver is installed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2055153 Title: [Lenovo Legion Pro 7 16IRX8H] Boots slowly or not at all when NVIDIA driver is installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.5/+bug/2055153/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs