Comment 0 for bug 803051

The LED-Illuminated LCD brightness cannot be changed neither
1) using hot keys, Fn+Up and Fn+Down (both are detected by acpi_listen, but dbus does not detect Fn+Up -- if needed I file another bug on this issue only)
or 2) echo 1 > /sys/class/backlight/acpi_video0/brightness (no changes on display)
or 3) using /proc/acpi/video ... (which do not exist).

The only way is calling 'nvidia-settings -a brightness=xxx'. I don't know if this hardware accepts real brightness changes, if not (so it is not a bug in linux), I would be glad if you can help me tweak acpi and dbus to call nvidia-settings (nvclock does not work).

$ acpi_listen
video LCD 00000086 00000000 [Fn+Up]
video LCD 00000087 00000000 [Fn+Down]

$ dbus-monitor interface="org.gnome.PowerManager.Backlight"
signal sender=org.freedesktop.DBus -> dest=:1.143 serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameAcquired
   string ":1.143"
[Fn+Up does nothing, but Fn+Down:]
signal sender=:1.16 -> dest=(null destination) serial=62 path=/org/gnome/PowerManager/Backlight; interface=org.gnome.PowerManager.Backlight; member=BrightnessChanged
   uint32 87

Thank you in advance.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: dedalu 1982 F.... pulseaudio
CRDA: Error: [Errno 2] Arquivo ou diretório não encontrado
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd9100000 irq 46'
   Mixer name : 'Realtek ALC272'
   Components : 'HDA:10ec0272,18540832,00100001'
   Controls : 16
   Simple ctrls : 9
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xd3000000 irq 17'
   Mixer name : 'Nvidia GPU 0d HDMI/DP'
   Components : 'HDA:10de000d,10de0101,00100100'
   Controls : 16
   Simple ctrls : 4
Date: Tue Jun 28 12:49:39 2011
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=15b1a0e3-8294-45bf-8b75-b407aa6cde60
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: LG Electronics R590-P.BN58P1
ProcEnviron:
 LANGUAGE=pt_BR:en
 PATH=(custom, user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=d885c9b0-0614-41b8-a984-45d7fea64afc ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.52
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/06/2010
dmi.bios.vendor: INSYDE
dmi.bios.version: QL4L3I51
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: Intel Corp.
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvrQL4L3I51:bd01/06/2010:svnLGElectronics:pnR590-P.BN58P1:pvrTBD:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
dmi.product.name: R590-P.BN58P1
dmi.product.version: TBD
dmi.sys.vendor: LG Electronics