Screen goes black randomly after upgrade from Xubuntu 18.04.5 LTS to Xubuntu 20.04.2 LTS

[AlexW]

Since I upgraded to 20.04.2 LTS I've had a problem (about once a day) with my screen going black. The computer is not unresponsive, but the only way to wake the screen up is to close and open the laptop lid. External screen is not affected.

I'm on a HP Elitebook 820 notebook.

Searched journalctl and dmesg logs but I can't find anything relevant there, so suspecting this has to do with a change of display driver and/or settings in the new version.

Please contact me if more info would be helpful. Wish you a great day!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-66-generic 5.4.0-66.74
ProcVersionSignature: Ubuntu 5.4.0-66.74-generic 5.4.86
Uname: Linux 5.4.0-66-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: a 1350 F.... pulseaudio
 /dev/snd/controlC1: a 1350 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Fri Mar 12 15:26:46 2021
HibernationDevice: RESUME=UUID=add5c1ba-194d-4f4d-af77-7049d2c84b9a
InstallationDate: Installed on 2017-09-23 (1266 days ago)
InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
MachineType: Hewlett-Packard HP EliteBook 820 G1
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-66-generic root=UUID=be312993-03d0-453d-97c0-f598bedc47ae ro text
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-66-generic N/A
 linux-backports-modules-5.4.0-66-generic N/A
 linux-firmware 1.187.9
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2021-01-13 (58 days ago)
dmi.bios.date: 10/04/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L71 Ver. 01.03
dmi.board.name: 1991
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 15.48
dmi.chassis.asset.tag: CNU3459W62
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.03:bd10/04/2013:svnHewlett-Packard:pnHPEliteBook820G1:pvrA3009DD10203:rvnHewlett-Packard:rn1991:rvrKBCVersion15.48:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
dmi.product.name: HP EliteBook 820 G1
dmi.product.sku: D7V73AV
dmi.product.version: A3009DD10203
dmi.sys.vendor: Hewlett-Packard

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Sean Davis (bluesabre)]

There's a few possibilities:

1. Check if you have both light-locker and xfce4-screensaver installed. If you do, you should be able to safely uninstall light-locker.
2. It could be related to graphics. Please run `inxi -G` and provide the output so we can identify your graphics card and driver.

[AlexW (3-alex-p)]

Hey Sean,

Thanks for you concern!

1. Yes, I had. Removed light-locker today. Since the problem happens only a few times a day it might take a while until I notice if there's a change.

2.
    $ inxi -G
    Graphics: Device-1: Intel Haswell-ULT Integrated Graphics driver: i915 v: kernel
               Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa tty: N/A
               OpenGL: renderer: Mesa DRI Intel HD Graphics 4400 (HSW GT2) v: 4.5 Mesa 20.2.6

[AlexW (3-alex-p)]

Unfortunately original problem is still present after removal of light-locker.