Public bug reported: Following instructions on https://wiki.kubuntu.org/Kernel/Debugging/Backlight
I have tried in /etc/default/grub: kernel parameters acpi_backlight=vendor, thinkpad-acpi.brightness_enable=1. I have tried /usr/share/X11/xorg.conf.d/10-brightness-control.conf: Option "RegistryDwords" "EnableBrightnessControl=1" I have tried editing /sys/class/backlight/acpi_video0/brightness with tee None of these have enabled brightness control. If I boot with integrated graphics instead of Nvidia, it works fine. (Note: this laptop has Optimus). Any further suggestions? ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: linux-image-3.5.0-18-generic 3.5.0-18.29 ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7 Uname: Linux 3.5.0-18-generic x86_64 ApportVersion: 2.6.1-0ubuntu6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: mwhite 2138 F.... pulseaudio /dev/snd/controlC0: mwhite 2138 F.... pulseaudio Date: Tue Nov 27 23:39:07 2012 HibernationDevice: RESUME=UUID=c574cd15-a9b9-4064-b22e-62b5bf4ce531 InstallationDate: Installed on 2012-11-27 (0 days ago) InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5) MachineType: LENOVO 2359CTO MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic.efi.signed root=UUID=fdfd5708-06eb-454a-a3c7-bdd98054c811 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.5.0-18-generic N/A linux-backports-modules-3.5.0-18-generic N/A linux-firmware 1.95 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/13/2012 dmi.bios.vendor: LENOVO dmi.bios.version: G4ET62WW (2.04 ) dmi.board.asset.tag: Not Available dmi.board.name: 2359CTO dmi.board.vendor: LENOVO dmi.board.version: Win8 Pro DPK TPG dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG4ET62WW(2.04):bd09/13/2012:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 2359CTO dmi.product.version: ThinkPad T530 dmi.sys.vendor: LENOVO ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug quantal running-unity ** Attachment added: "command_output" https://bugs.launchpad.net/bugs/1083984/+attachment/3445786/+files/command_output -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1083984 Title: Brightness control doesn't work on Lenovo Thinkpad T530 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1083984/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs