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[benmhall <ubuntu@xxxxxxxxxxxxxx>]

I also have a ThinkPad X220 that is exhibiting the same symptoms.  It is
running the latest BIOS. (1.39). I am running kernel 3.13.0-35-generic
#62~precise1-Ubuntu and xserver-xorg-video-intel-lts-trusty
2:2.99.910-0ubuntu1~precise1. I moved the drive from a ThinkPad X201s
(Core i7 but previous generation of CPU and GPU.) Everything was working
perfectly with the X201, so this looks to be an X220-specific bug.

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https://bugs.launchpad.net/bugs/1345499

Title:
  [Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken
  when going from docked -> undocked

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  The brightness control on the Lenovo ThinkPad x220 is no longer
  working after undocking. It is stuck an the lowest level and can't by
  changed with the hotkeys. There is /sys/class/backlight/acpi_video0/
  which has no effect. The bug occurs when using kernel 3.13 on 12.04
  and on 14.04.

  WORKAROUND: Set the brightness through /sys/class/backlight/intel_backlight/
  The hotkeys are working again after setting the brightness once on the command line.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55~precise1
  ProcVersionSignature: Ubuntu 3.13.0-30.55~precise1-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Sun Jul 20 09:39:01 2014
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-32-generic.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CX20590 Analog [CX20590 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jo         2697 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf1520000 irq 45'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:14f1506e,17aa21da,00100002 HDA:80862805,80860101,00100000'
     Controls      : 43
     Simple ctrls  : 12
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
     Mixer name	: 'ThinkPad EC (unknown)'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=749609cc-8e4e-491e-9194-cbae6b309e18
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  Lsusb:
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 004: ID 04f2:b217 Chicony Electronics Co., Ltd
  MachineType: LENOVO 4290W1A
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=/dev/mapper/vg_nova-ubuntu ro quiet splash nmi_watchdog=0 vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.79.16
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  precise
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adbusers adm cdrom dip lpadmin plugdev sambashare sudo vboxusers wireshark www-data
  dmi.bios.date: 04/11/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET68WW (1.38 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4290W1A
  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:bvr8DET68WW(1.38):bd04/11/2013:svnLENOVO:pn4290W1A:pvrThinkPadX220:rvnLENOVO:rn4290W1A:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4290W1A
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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