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[Bug 1345499] Re: [Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken when going from docked -> undocked

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apport information

** Tags added: apport-collected

** Description changed:

  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

** Attachment added: "AcpiTables.txt"
   https://bugs.launchpad.net/bugs/1345499/+attachment/4158262/+files/AcpiTables.txt

-- 
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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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