** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1872229
Title: screen backlight can't be changed Status in linux package in Ubuntu: New Bug description: Hi, changing the screen brightness in the Ubuntu settings does not change the brightness of the screen. Changing the brightness for example with the fn keys changes the value in /sys/class/backlight/dell_backlight/brightness but not the screen brightness. There is also a /sys/class/backlight/intel_backlight but changing the brightness file there manually also has no effect. The acpi_backlight=vendor option did not work out. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-21-generic 5.4.0-21.25 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu26 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: benedict 1744 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sat Apr 11 20:38:51 2020 InstallationDate: Installed on 2020-04-08 (2 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402) MachineType: Dell Inc. XPS 15 7590 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=8bbcafe3-01fd-4b8e-8924-1c0d0efa9270 ro quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-21-generic N/A linux-backports-modules-5.4.0-21-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/11/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.4.0 dmi.board.name: 0T8KGX dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.4.0:bd11/11/2019:svnDellInc.:pnXPS157590:pvr:rvnDellInc.:rn0T8KGX:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 15 7590 dmi.product.sku: 0905 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872229/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
