[Bug 1937914] Re: [HP Probook 450 G6] Laptop Monitor Turns off During Startup, but older kernel versions work

*** This bug is a duplicate of bug 1939160 ***
https://bugs.launchpad.net/bugs/1939160

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux (Ubuntu)
Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1937914

Title:
[HP Probook 450 G6] Laptop Monitor Turns off During Startup, but older
kernel versions work

Status in linux package in Ubuntu:
Confirmed

Bug description:
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: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 24 14:28:51 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company UHD Graphics 620 (Whiskey Lake) [103c:8538]
Subsystem: Hewlett-Packard Company GM108M [GeForce MX130] [103c:8542]
InstallationDate: Installed on 2021-07-06 (17 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 06cb:00b7 Synaptics, Inc.
Bus 001 Device 002: ID 04f2:b66a Chicony Electronics Co., Ltd HP HD Camera
Bus 001 Device 004: ID 0bda:b00b Realtek Semiconductor Corp. Bluetooth Radio
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP ProBook 450 G6
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=8bde40df-a693-4c3a-b5be-05611212add4 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/27/2020
dmi.bios.vendor: HP
dmi.bios.version: R71 Ver. 01.11.01
dmi.board.name: 8538
dmi.board.vendor: HP
dmi.board.version: KBC Version 51.2A.00
dmi.chassis.asset.tag: 5CD9308H3X
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrR71Ver.01.11.01:bd04/27/2020:svnHP:pnHPProBook450G6:pvr:rvnHP:rn8538:rvrKBCVersion51.2A.00:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP ProBook
dmi.product.name: HP ProBook 450 G6
dmi.product.sku: 5YH15UT#ABA
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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