Public bug reported:
Since kernel 7.0.0-28.28 update, screen is dimmed to the minimum and barely
readable despite having tried to disable "dim screen", "automatic power saver"
or automatic brightness adaptation to ambient light options. I have tried
several reboots with different grub options, nothing works.
When I turn on the laptop, the brightness is normal at start and is dimmed
automatically when the ubuntu loader is still loading.
When downgrading kernel to 7.0.0-27.27, the brightness is restored and works
properly.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: nico 4949 F.... wireplumber
/dev/snd/seq: nico 4930 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 18 00:30:45 2026
InstallationDate: Installed on 2025-04-19 (455 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
MachineType: Dell Inc. Latitude 7420
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic
root=UUID=78cf57fd-c2c7-4009-86c8-8a406e9fa8ff ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-04-24 (85 days ago)
dmi.bios.date: 04/23/2026
dmi.bios.release: 1.50
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.50.1
dmi.board.name: 0PKK8F
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.50.1:bd04/23/2026:br1.50:svnDellInc.:pnLatitude7420:pvr:rvnDellInc.:rn0PKK8F:rvrA00:cvnDellInc.:ct10:cvr:sku0A36:pfaLatitude:
dmi.product.family: Latitude
dmi.product.name: Latitude 7420
dmi.product.sku: 0A36
dmi.sys.vendor: Dell Inc.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161160
Title:
Screen is dimmed to the minimum
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