Public bug reported:
I upgraded to Focal Fossa 3 days ago and nothing broke. At the time, it
was still using linux 5.3 (linux-image-5.3.0-24-generic).
Today, it updated to linux 5.4 (linux-image-5.4.0-9-generic) and after
rebooting, the screen brightness does not work anymore - neither from
keyboard keys nor from the slider in the gnome-shell panel.
It works again when rebooting into the previous linux-
image-5.3.0-24-generic kernel.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-9-generic 5.4.0-9.12
ProcVersionSignature: Ubuntu 5.4.0-9.12-generic 5.4.3
Uname: Linux 5.4.0-9-generic x86_64
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mario 1892 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 8 20:23:31 2020
InstallationDate: Installed on 2018-09-13 (481 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180912)
MachineType: Dell Inc. XPS 15 9575
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-9-generic
root=UUID=26ff4c95-5f68-4121-b7d0-989fa705fcc8 ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-5.4.0-9-generic N/A
linux-backports-modules-5.4.0-9-generic N/A
linux-firmware 1.184
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-01-04 (3 days ago)
dmi.bios.date: 07/07/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.7.1
dmi.board.name: 0C32VW
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 31
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.7.1:bd07/07/2019:svnDellInc.:pnXPS159575:pvr:rvnDellInc.:rn0C32VW:rvrA00:cvnDellInc.:ct31:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9575
dmi.product.sku: 080D
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal wayland-session
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https://bugs.launchpad.net/bugs/1858844
Title:
[Dell XPS 15 9575] Screen brightness stopped working with linux-
image-5.4.0-9-generic
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