Sounds about right. I think the default systemd timeout for anything that's broken is 90 seconds.
Maybe also related: Owners of AMD Legion 5 machines have some trouble too: bug 1944094, bug 2015255, bug 1899626 ** Summary changed: - Very slow boot using hybrid setup + 90 second delay during boot [Failed to start systemd-backlight@backlight:nvidia_0.service] ** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Summary changed: - 90 second delay during boot [Failed to start systemd-backlight@backlight:nvidia_0.service] + [Lenovo Legion 5i pro] 90 second delay during boot (Failed to start systemd-backlight@backlight:nvidia_0.service) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-graphics-drivers-525 in Ubuntu. https://bugs.launchpad.net/bugs/2015397 Title: [Lenovo Legion 5i pro] 90 second delay during boot (Failed to start systemd-backlight@backlight:nvidia_0.service) Status in linux package in Ubuntu: New Status in nvidia-graphics-drivers-525 package in Ubuntu: New Bug description: Hi, Lunar, 525.105.17 I get a very very very slow boot using dynamic graphics in my Lenovo Legion 5i pro i7/3070 Ti. Using discrete graphics is ok. Using Nouveau with hybrid graphics is ok. After some research, it seems the culprit is: Failed to start systemd-backlight@backlight:nvidia_0.service - Load/Save Screen Backlight Brightness of backlight:nvidia_0. systemd blame: 1min 34.046s plymouth-quit-wait.service 1min 30.278s gpu-manager.service To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2015397/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp