Update - I just started 3.13.0-39-generic from Trusty (on which everything was OK). But now it doesn't work. I can control brightness before X is started, but when lighdm starts brightness control no longer works. IMHO this is rather related to X server, not kernel, what do you think?
-- 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/1391153 Title: Thnikpad X220 - brightness control doesn't work Status in “linux” package in Ubuntu: Incomplete Bug description: After upgrading to Ubuntu 14.10 brightness control no longer works on Lenovo Thinkpad X220. Fn+Home/Fn+End doesn't work, the only way is to echo value to: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/brightness I use Awesome WM, but it doesn't seem to be related to Awesome. --- ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D0p: narel 3706 F...m pulseaudio /dev/snd/controlC0: narel 3706 F.... pulseaudio DistroRelease: Ubuntu 14.10 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=0f22933e-6234-43cf-8687-1245585a3025 InstallationDate: Installed on 2014-01-03 (318 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: LENOVO 4290PB8 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic root=/dev/mapper/ubuntu--vg-root ro acpi_backlight=vendor quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4 RelatedPackageVersions: linux-restricted-modules-3.16.0-24-generic N/A linux-backports-modules-3.16.0-24-generic N/A linux-firmware 1.138 Tags: utopic Uname: Linux 3.16.0-24-generic x86_64 UpgradeStatus: Upgraded to utopic on 2014-11-07 (10 days ago) UserGroups: adm audio cdrom dialout dip libvirtd lpadmin plugdev pulse pulse-access remote sambashare sudo _MarkForUpload: True dmi.bios.date: 07/19/2012 dmi.bios.vendor: LENOVO dmi.bios.version: 8DET63WW (1.33 ) dmi.board.asset.tag: Not Available dmi.board.name: 4290PB8 dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr8DET63WW(1.33):bd07/19/2012:svnLENOVO:pn4290PB8:pvrThinkPadX220:rvnLENOVO:rn4290PB8:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4290PB8 dmi.product.version: ThinkPad X220 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1391153/+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