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[JMR <613638@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 562005 ***
    https://bugs.launchpad.net/bugs/562005

I have the exact same issue as the reporter with my Thinkpad X1 Carbon,
which has a Intel card. So it's not Nvidia specifc. The terminal
workaround works as well here.

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https://bugs.launchpad.net/bugs/613638

Title:
  Adjusting brightness broken after hibernate/suspend

Status in “nvidia-graphics-drivers” package in Ubuntu:
  Confirmed

Bug description:
  When booting the system normally, the FN+Home (Brightness Up) and FN+End (Brightness down) hotkeys work perfectly.
  However, after hibernating or suspending, nothing happens when these keys are pressed.
  Also doing: echo "X" > /proc/acpi/video/VID/LCD0/brightness
  does not work.
  When pressing the hotkeys, I can see the value of this proc entry change correctly though.

  I can still change the screen brightness by switching to a terminal
  using CTRL+ALT+F1, and use the brightness hotkeys there, and then
  switch back to the X session.

  It is like the brightness value is being changed in the system, but the event is not signalled to the screen.
  For example if I use the hotkeys to change to brightness value from full to lowest, and then go to the terminal and use the hotkey, the screen immediatly jumps from full brightness to lowest brightness (eg. stored value is applied).
  Also if the screen is on full brightness, and I adjust the brightness to lowest and reboot, the system will boot up with low brightness.
  Eg. the brightness value I see in /proc/acpi/video/VID/LCD0/brightness is applied to the screen after reboot.

  Machine: Lenovo W510

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-24-generic 2.6.32-24.38
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic i686
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dvdw       1707 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 17'
     Mixer name	: 'Conexant ID 5069'
     Components	: 'HDA:14f15069,17aa218b,00100302'
     Controls      : 6
     Simple ctrls  : 4
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xcdefc000 irq 16'
     Mixer name	: 'Nvidia ID a'
     Components	: 'HDA:10de000a,10de0101,00100100'
     Controls      : 0
     Simple ctrls  : 0
  Card1.Amixer.values:
   
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6MHT37WW-1.12'
     Mixer name	: 'ThinkPad EC 6MHT37WW-1.12'
     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]
  Date: Wed Aug  4 22:51:33 2010
  HibernationDevice: RESUME=UUID=e9cae751-6db3-47a6-b967-731f28d4c7cd
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: LENOVO 431929G
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=5ba053dc-ef1e-4c23-889b-bc8464782a47 ro quiet splash resume=UUID=443a06ea-be9c-4e68-872a-16c3633eb88a
  ProcEnviron:
   LANGUAGE=en
   LANG=nl_BE.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34.1
  SourcePackage: linux
  dmi.bios.date: 05/18/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6NET57WW (1.20 )
  dmi.board.name: 431929G
  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:bvr6NET57WW(1.20):bd05/18/2010:svnLENOVO:pn431929G:pvrThinkPadW510:rvnLENOVO:rn431929G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 431929G
  dmi.product.version: ThinkPad W510
  dmi.sys.vendor: LENOVO

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