Public bug reported:
Yesterday Ubuntu asked me to reboot after automatic updates, and when I
rebooted it doesn't start up. Sometimes it stays on the Dell logo,
sometimes it goes to a black screen and doesn't get past that (not sure
what causes each variation -- perhaps for reboot it does the Dell logo,
cold start up it does the black screen?).
After the updates it's trying to boot the 5.8.0 kernel. In the boot
menu, if I manually select the 5.4.0 kernel everything works fine. So
presumably it's something about the 5.8 kernel on this hardware.
When this occurred I was running the Nouveau open source graphics
driver. I switched to the NVIDIA driver (460) to see if that would help,
but it didn't change anything. So it may or may not be graphics related.
I'm attaching my /var/log/kern.log and /var/log/syslog for yesterday --
Jan 12, I think it would be around 13:30 that I first rebooted after the
upgrade (and a bunch of times after that). I ran the logs through grep
-v 'var-snap-lxd-common-lxd' as a huge percentage of the lines were this
(presumably irrelevant):
Jan 12 19:09:55 BenXPS15 kernel: [14515.297170] audit: type=1400
audit(1610431795.003:29126): apparmor="DENIED" operation="open"
namespace="root//lxd-juju-804318-0_<var-snap-lxd-common-lxd>"
profile="snap.juju-db.daemon" name="/proc/631/net/netstat" pid=3906
comm="ftdc" requested_mask="r" denied_mask="r" fsuid=1000000
ouid=1000000
For reference:
* This is a Dell XPS 15 (9550) laptop with an NVIDIA GeForce GTX 960M (I think
it's hybrid graphics). i7-6700HQ 2.6GHz with 8 cores, 256 GB SSD, 16 MB RAM.
* I installed Ubuntu 20.04 Focal in August 2020, and now it says it's on
"Ubuntu 20.04.1 LTS".
* /proc/version_signature: Ubuntu 5.4.0-59.65-generic 5.4.78
* "sudo lspci -vnvn" output is included in the attached logs.zip
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "logs.zip"
https://bugs.launchpad.net/bugs/1911352/+attachment/5452414/+files/logs.zip
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https://bugs.launchpad.net/bugs/1911352
Title:
Black screen on boot after 20.04 upgraded to kernel 5.8
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