** Summary changed: - Screen is dimmed to the minimum + Screen is dimmed to the minimum and can't be increased
** Description changed: 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. + Brightness can't be adjusted nor increased back from either from physical buttons or settings panel. 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 + 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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2161160 Title: Screen is dimmed to the minimum and can't be increased To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161160/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
