Public bug reported: I cannot adjust the screen brightness using the keyboard keys or changing /sys/call/backlight/intel_backlight/brightness values. I've only been able to adjust the backlight using xrandr.
Followed bug report on https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Diagnostic_Techniques and attached files. Additional information: 1. echo 8 > /sys/class/backlight/intel_backlight/brightness does not change the screen brightness 2. video.use_bios_initial_backlight=0 does not enable brightness to be changed 3. Cannot login to when using kernel paramater acpi_osi=. Login does not work and on one boot "y"s were being continuously typed without any keys being depressed. It was odd. 4. video.use_native_backlight=1 does not enabel brightness to be changed 5. Created file /usr/share/X11/xorg.conf.d/80-backlight.conf and it had no impact ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-26-generic 5.3.0-26.28 ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13 Uname: Linux 5.3.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jaredy 1649 F.... pulseaudio /dev/snd/pcmC0D0p: jaredy 1649 F...m pulseaudio CurrentDesktop: ubuntu:GNOME Date: Sun Jan 19 19:51:45 2020 InstallationDate: Installed on 2020-01-03 (16 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: HP HP Spectre x360 Convertible 13t-aw100 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-generic root=UUID=5f505587-b59b-4abd-b8f2-28c04ab84c64 ro quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.3.0-26-generic N/A linux-backports-modules-5.3.0-26-generic N/A linux-firmware 1.183.3 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/15/2019 dmi.bios.vendor: AMI dmi.bios.version: F.10 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 86FA dmi.board.vendor: HP dmi.board.version: 87.43 dmi.chassis.type: 31 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAMI:bvrF.10:bd11/15/2019:svnHP:pnHPSpectrex360Convertible13t-aw100:pvr:rvnHP:rn86FA:rvr87.43:cvnHP:ct31:cvrChassisVersion: dmi.product.family: 103C_5335KV HP Spectre dmi.product.name: HP Spectre x360 Convertible 13t-aw100 dmi.product.sku: 6YG70AV dmi.sys.vendor: HP ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug eoan ** Attachment added: "Bug report following guidance on https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Diagnostic_Techniques"; https://bugs.launchpad.net/bugs/1860303/+attachment/5321620/+files/backlight%20bug%20report.tar.xz -- 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/1860303 Title: Backlight brightness cannot be adjusted using keys Status in linux package in Ubuntu: New Bug description: I cannot adjust the screen brightness using the keyboard keys or changing /sys/call/backlight/intel_backlight/brightness values. I've only been able to adjust the backlight using xrandr. Followed bug report on https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Diagnostic_Techniques and attached files. Additional information: 1. echo 8 > /sys/class/backlight/intel_backlight/brightness does not change the screen brightness 2. video.use_bios_initial_backlight=0 does not enable brightness to be changed 3. Cannot login to when using kernel paramater acpi_osi=. Login does not work and on one boot "y"s were being continuously typed without any keys being depressed. It was odd. 4. video.use_native_backlight=1 does not enabel brightness to be changed 5. Created file /usr/share/X11/xorg.conf.d/80-backlight.conf and it had no impact ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-26-generic 5.3.0-26.28 ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13 Uname: Linux 5.3.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jaredy 1649 F.... pulseaudio /dev/snd/pcmC0D0p: jaredy 1649 F...m pulseaudio CurrentDesktop: ubuntu:GNOME Date: Sun Jan 19 19:51:45 2020 InstallationDate: Installed on 2020-01-03 (16 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) MachineType: HP HP Spectre x360 Convertible 13t-aw100 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-generic root=UUID=5f505587-b59b-4abd-b8f2-28c04ab84c64 ro quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.3.0-26-generic N/A linux-backports-modules-5.3.0-26-generic N/A linux-firmware 1.183.3 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/15/2019 dmi.bios.vendor: AMI dmi.bios.version: F.10 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 86FA dmi.board.vendor: HP dmi.board.version: 87.43 dmi.chassis.type: 31 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAMI:bvrF.10:bd11/15/2019:svnHP:pnHPSpectrex360Convertible13t-aw100:pvr:rvnHP:rn86FA:rvr87.43:cvnHP:ct31:cvrChassisVersion: dmi.product.family: 103C_5335KV HP Spectre dmi.product.name: HP Spectre x360 Convertible 13t-aw100 dmi.product.sku: 6YG70AV dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1860303/+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
