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[narel <1391153@xxxxxxxxxxxxxxxxxx>]

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?

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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

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