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]: :00:02.0:
Worker [560] processing SEQNUM=4649 is taking a long time
Feb 28 14:13:56
** Attachment added: "failboot case#3"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750030/+files/failedboot2.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
** Attachment added: "failboot case#1"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750028/+files/failedboot.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
** Attachment added: "failboot case#2"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750029/+files/failedboot1.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
** Attachment added: "slowboot case#3"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750026/+files/slowboot2.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
** Attachment added: "slowboot case#4"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750027/+files/slowboot3.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
** Attachment added: "slowboot case#1"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750024/+files/slowboot.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
** Attachment added: "slowboot case#2"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-535/+bug/2055153/+attachment/5750025/+files/slowboot1.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
