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Backlight control on HP Pavilion dv7 6104eg notebook doesn't work using
function keys or Gnome power management applet. I found a patch, that
should solve the problem:
http://www.edgrochowski.com/articles/backlight.htm (haven't tried it
yet)

lsmod:
Module                  Size  Used by
parport_pc             36959  0
ppdev                  17113  0
rfcomm                 47694  8
binfmt_misc            17565  1
sco                    18187  2
bnep                   18308  2
l2cap                  53570  16 rfcomm,bnep
vboxnetadp             13340  0
vboxnetflt             28297  0
vboxdrv               252684  2 vboxnetadp,vboxnetflt
snd_hda_codec_hdmi     28167  1
snd_hda_codec_idt      71137  1
arc4                   12529  2
joydev                 17606  0
uvcvideo               72195  0
usbhid                 46956  0
iwlagn                333716  0
snd_hda_intel          33176  4
snd_hda_codec         103804  3 
snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep              13604  1 snd_hda_codec
iwlcore               167502  1 iwlagn
snd_pcm                96391  4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
videodev               82052  1 uvcvideo
i915                  515121  3
snd_seq_midi           13324  0
snd_rawmidi            30486  1 snd_seq_midi
btusb                  18600  2
snd_seq_midi_event     14899  1 snd_seq_midi
bluetooth              72320  9 rfcomm,sco,bnep,l2cap,btusb
snd_seq                61621  2 snd_seq_midi,snd_seq_midi_event
snd_timer              29602  2 snd_pcm,snd_seq
v4l2_compat_ioctl32    17078  1 videodev
snd_seq_device         14462  3 snd_seq_midi,snd_rawmidi,snd_seq
hid                    91020  1 usbhid
hp_wmi                 13706  0
sparse_keymap          13898  1 hp_wmi
mac80211              294370  2 iwlagn,iwlcore
psmouse                73535  0
snd                    67382  17 
snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
drm_kms_helper         42136  1 i915
serio_raw              13166  0
cfg80211              178528  3 iwlagn,iwlcore,mac80211
rts_pstor             440614  0
drm                   227534  4 i915,drm_kms_helper
soundcore              12680  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
i2c_algo_bit           13400  1 i915
video                  19438  1 i915
hp_accel               21880  0
lis3lv02d              19893  1 hp_accel
max6650                14324  0
input_polldev          14007  1 lis3lv02d
coretemp               13490  0
lp                     17825  0
parport                46458  3 parport_pc,ppdev,lp
ahci                   25951  2
xhci_hcd               77643  0
libahci                26642  1 ahci
r8169                  48022  0

---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  matthias   1587 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xc7500000 irq 53'
   Mixer name   : 'Intel CougarPoint HDMI'
   Components   : 'HDA:111d7605,103c3389,00100105 
HDA:80862805,80860101,00100000'
   Controls      : 18
   Simple ctrls  : 10
DistroRelease: Ubuntu 11.04
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: Hewlett-Packard HP Pavilion dv7 Notebook PC
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-11-generic 
root=UUID=6562386e-524b-41be-8383-6e1944f15f1c ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-11-generic N/A
 linux-backports-modules-2.6.38-11-generic  N/A
 linux-firmware                             1.52
StagingDrivers: rts_pstor
Tags:  natty staging
Uname: Linux 2.6.38-11-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 07/20/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.1A
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3389
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 10.31
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.1A:bd07/20/2011:svnHewlett-Packard:pnHPPaviliondv7NotebookPC:pvr058D110000244620001620100:rvnHewlett-Packard:rn3389:rvr10.31:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dv7 Notebook PC
dmi.product.version: 058D110000244620001620100
dmi.sys.vendor: Hewlett-Packard

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


** Tags: apport-collected bios-outdated-f1.b natty staging
-- 
[HP Pavilion dv7-6104eg Entertainment Notebook PC] Backlight control doesn't 
work
https://bugs.launchpad.net/bugs/847187
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