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[Launchpad Bug Tracker <613638@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: nvidia-graphics-drivers (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-bug hibernate i386 lucid needs-upstream-testing regression-potential resume
-- 
Adjusting brightness broken after hibernate/suspend
https://bugs.launchpad.net/bugs/613638
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