** Description changed: After updating to Ubuntu 26.04 LTS with kernel 7.0.0-28-generic, the laptop screen brightness no longer changes. Laptop: Dell Inspiron 5558 GPU: Intel HD Graphics 5500 (i915) The brightness OSD appears and the brightness slider moves normally. The values in /sys/class/backlight/intel_backlight/brightness and actual_brightness change correctly (e.g. from 1023 to 51), but the actual LCD backlight brightness does not change. The issue started immediately after the kernel update. 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/controlC1: loma 4091 F.... wireplumber - /dev/snd/controlC0: loma 4091 F.... wireplumber - /dev/snd/seq: loma 4085 F.... pipewire + USER PID ACCESS COMMAND + /dev/snd/controlC1: loma 4091 F.... wireplumber + /dev/snd/controlC0: loma 4091 F.... wireplumber + /dev/snd/seq: loma 4085 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Wed Jul 22 04:15:42 2026 InstallationDate: Installed on 2026-05-06 (77 days ago) InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007) MachineType: Dell Inc. Inspiron 5558 ProcEnviron: - LANG=en_US.UTF-8 - PATH=(custom, no user) - SHELL=/bin/bash - TERM=xterm-256color - XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + PATH=(custom, no user) + SHELL=/bin/bash + TERM=xterm-256color + XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic root=UUID=c12fbad0-c76a-4137-88d5-6449f232849d 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 2026-05-19 (64 days ago) dmi.bios.date: 12/30/2019 dmi.bios.release: 65.18 dmi.bios.vendor: Dell Inc. dmi.bios.version: A18 dmi.board.name: 0TYKPW dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA18:bd12/30/2019:br65.18:svnDellInc.:pnInspiron5558:pvr:rvnDellInc.:rn0TYKPW:rvrA00:cvnDellInc.:ct9:cvr:sku06AE:pfa: dmi.product.name: Inspiron 5558 dmi.product.sku: 06AE dmi.sys.vendor: Dell Inc.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2161478 Title: Screen brightness does not change on Dell Inspiron 5558 after updating to kernel 7.0.0-28 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161478/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
