Public bug reported:

When working on HP EliteBook 8540w the screen gets lighter (up to 100%
brightness) and then darker (down to ~50% brightness). And it goes on
and on. It's kind of annoying. I think it was not like that before
upgrade to 11.10.

I have the screen setting to dim the screen on inactivity turned off.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-14-generic 3.0.0-14.23
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  pkot      17648 F.... pulseaudio
 /dev/snd/controlC0:  pkot      17648 F.... pulseaudio
CRDA: Error: [Errno 2] Nie ma takiego pliku ani katalogu
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd7520000 irq 53'
   Mixer name   : 'IDT 92HD75B3X5'
   Components   : 'HDA:111d7603,103c1521,00100202 
HDA:11c11040,103c3066,00100200'
   Controls      : 14
   Simple ctrls  : 9
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xd3000000 irq 16'
   Mixer name   : 'Nvidia GPU 0a HDMI/DP'
   Components   : 'HDA:10de000a,10de0101,00100100'
   Controls      : 16
   Simple ctrls  : 4
Date: Mon Dec 26 12:31:14 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: Hewlett-Packard HP EliteBook 8540w
PccardctlIdent:
 Socket 0:
   product info: "RICOH", "Bay8Controller", "", ""
   manfid: 0x0000, 0x0000
   function: 254 (unknown)
PccardctlStatus:
 Socket 0:
   3.3V 16-bit PC Card
   Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcEnviron:
 PATH=(custom, user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-generic 
root=UUID=e1ae4207-8aba-4238-b680-459cfadf7b6d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-14-generic N/A
 linux-backports-modules-3.0.0-14-generic  N/A
 linux-firmware                            1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to oneiric on 2011-12-16 (9 days ago)
dmi.bios.date: 11/25/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68CVD Ver. F.0E
dmi.board.name: 1521
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 32.33
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68CVDVer.F.0E:bd11/25/2010:svnHewlett-Packard:pnHPEliteBook8540w:pvr:rvnHewlett-Packard:rn1521:rvrKBCVersion32.33:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8540w
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric running-unity staging

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https://bugs.launchpad.net/bugs/908742

Title:
  screen backlight changes automatically for no reason

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