Public bug reported:
I had previously submitted this bug here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1937914 , but I
submitted a system log from an older, working version of Ubuntu rather
than from the failing version. This report has the updated log.
While starting the my laptop
(Computer Model: HP Probook 450 G6
ProdID 5YH15UT#ABA
Memory: 15.5 GB
Processor: Intel Core i7-8565U CPU @ 1.80GHz x 8
Graphics: NV118 / Mesa Intel UHD Graphics 620 (WHL GT2)
Disk Capacity: 256.1 GB)
which runs
(OS Name: Ubuntu 20.04.2 LTS
OS Type: 64-bit
GNOME Version: 3.36.8
Windowing System: X11)
the monitor turns off as soon as Ubuntu loads. The OS loads as normal
and my external monitor still works, but my laptop monitor does not. I
was able to fix the problem by pressing ESC as soon as the HP logo
appears during start-up, then selecting "Advanced Ubuntu Options", then
choosing an older version of Ubuntu (currently that's ...5.4.0-48...,
while I believe the latest version is ...5.8.0-66...).
It seems clear that this problem is caused by a bug that was introduced
in one of the more recent updates (...5.8.0-59..., maybe?). I am not at
all sure that the problem is in xorg; the package identification webpage
just suggested that, if the monitor is blank when I would expect to see
the Ubuntu logo during startup, then I should say that the relevant
package is xorg.
I am more than happy to run additional diagnostics that you would
recommend if that would help you diagnose and fix the problem.
Thank you.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.11.0-25-generic 5.11.0-25.27~20.04.1
ProcVersionSignature: Ubuntu 5.11.0-25.27~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 6 10:34:40 2021
InstallationDate: Installed on 2021-07-06 (30 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-hwe-5.11
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-5.11 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1939160
Title:
[HP Probook 450 G6] Laptop Monitor Turns off During Startup, but older
kernel versions work (updated system log)
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