** Attachment added: "acpi_backlight=vendor ls -la sys-class-backlight-intel_backlight" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2016418/+attachment/5664439/+files/acpi_backlight%3Dvendor%20ls%20-la%20sys-class-backlight-intel_backlight
-- 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/2016418 Title: Intel Video Backlight keys do not work out of the box on Dell Precision 7510 Status in linux package in Ubuntu: Confirmed Bug description: After following https://wiki.ubuntu.com/Kernel/Debugging/Backlight I have these results regarding when backlight controls (on laptop AND on an external keybaord) operate in either GDM (login screen) and/or XFCE logged in session: With GRUB_CMDLINE_LINUX set to: * no options: GDM but not in XFCE session * acpi_backlight=vendor : neither * video.use_bios_initial_backlight=0 : GDM but not session (system seems slower) * acpi_osi= : works in both (sometimes doesn't after reboot, possibly if not plugged in) * video.use_native_backlight=1 : gdm but not session * /usr/share/X11/xorg.conf.d/80-backlight.conf : works in both. Default XFCE background image looks funny (vertical stripes). XFCE power manager's backlight brightness level indicator appears and changes with all of the above (but actual backlight brightness only changes with some of the settings as mentioned above) `echo 8 > /sys/class/backlight/intel_backlight/brightness` seems to always work. ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-69-generic 5.15.0-69.76 ProcVersionSignature: Ubuntu 5.15.0-69.76-generic 5.15.87 Uname: Linux 5.15.0-69-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: akom 2728 F.... pulseaudio /dev/snd/controlC1: akom 2728 F.... pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: XFCE Date: Sun Apr 16 10:10:54 2023 InstallationDate: Installed on 2017-05-10 (2166 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: Dell Inc. Precision 7510 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-69-generic root=UUID=fd5209d3-739b-4fdb-a117-4bd62009cd34 ro RelatedPackageVersions: linux-restricted-modules-5.15.0-69-generic N/A linux-backports-modules-5.15.0-69-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.12 SourcePackage: linux UpgradeStatus: Upgraded to jammy on 2022-08-19 (240 days ago) dmi.bios.date: 11/17/2022 dmi.bios.release: 1.30 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.30.3 dmi.board.name: 0M1YNP dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.asset.tag: 204286 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.30.3:bd11/17/2022:br1.30:svnDellInc.:pnPrecision7510:pvr:rvnDellInc.:rn0M1YNP:rvrA00:cvnDellInc.:ct9:cvr:sku06D9: dmi.product.family: Precision dmi.product.name: Precision 7510 dmi.product.sku: 06D9 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2016418/+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
