Public bug reported:
After upgrading from Linux 7.0.0-27 to 7.0.0-28, the LCD backlight can
no longer be adjusted.
Laptop: Fujitsu LIFEBOOK P727
GPU: Intel HD Graphics 620 (Kaby Lake-U)
Kubuntu 26.04 LTS
/sys/class/backlight/intel_backlight/brightness and actual_brightness both
change correctly.
The physical display brightness never changes.
KDE brightness slider and keyboard brightness keys also stop working.
Booting back into Linux 7.0.0-27 immediately restores correct brightness
control.
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: irfan 1619 F.... wireplumber
/dev/snd/seq: irfan 1612 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Fri Jul 24 19:38:24 2026
InstallationDate: Installed on 2025-11-19 (247 days ago)
InstallationMedia: Kubuntu 22.04.5 LTS "Jammy Jellyfish" - Release amd64
(20240911)
MachineType: FUJITSU LIFEBOOK P727
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic
root=UUID=5fd1e762-85e1-40ff-98a2-4cd01ee9a8ab ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-06-06 (48 days ago)
dmi.bios.date: 02/10/2025
dmi.bios.release: 1.29
dmi.bios.vendor: FUJITSU // Insyde Software Corp.
dmi.bios.version: Version 1.29
dmi.board.name: FJNB2A9
dmi.board.vendor: FUJITSU
dmi.board.version: G3
dmi.chassis.asset.tag: 3000000989
dmi.chassis.type: 31
dmi.chassis.vendor: FUJITSU
dmi.chassis.version: LIFEBOOK P727
dmi.modalias:
dmi:bvnFUJITSU//InsydeSoftwareCorp.:bvrVersion1.29:bd02/10/2025:br1.29:svnFUJITSU:pnLIFEBOOKP727:pvr10601736746:rvnFUJITSU:rnFJNB2A9:rvrG3:cvnFUJITSU:ct31:cvrLIFEBOOKP727:skuSK01:pfaLIFEBOOK-FTS:
dmi.product.family: LIFEBOOK-FTS
dmi.product.name: LIFEBOOK P727
dmi.product.sku: SK01
dmi.product.version: 10601736746
dmi.sys.vendor: FUJITSU
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161739
Title:
Backlight brightness no longer works on Fujitsu LIFEBOOK P727 with
Intel HD 620 after upgrading to Linux 7.0.0-28
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