XFCE4 and increase/decrease backlight

ftornell · 2010-10-22 06:13:27

Hi,
Have just installed archlinux on my samsung nc10 netbook.
Running xfce4 and need some help on how to get the Fn + the increase/decrease key to work.

Last edited by ftornell (2010-10-22 08:27:04)

ewaller · 2010-10-22 06:35:08

Are you running HAL?
Is there a file on your system like /class/backlight/acpi_video0/brightness ??

Last edited by ewaller (2010-10-22 06:35:41)

ftornell · 2010-10-22 06:40:47

Hi, there are no file (no folder at all called /class)

Yes, im running hal

txus · 2010-10-22 07:12:04

It's in /sys/class/....
But I have that file too, and still I have to use custom acpi scripts.

ftornell · 2010-10-22 07:58:16

now I found the backlight folder but its empty...

ewaller · 2010-10-22 15:26:28

Can you dig through the output of lshal and see if you have a section pertaining to the backlight? It will look something like this

udi = '/org/freedesktop/Hal/devices/computer_backlight'
  info.addons = {'hald-addon-generic-backlight'} (string list)
  info.capabilities = {'laptop_panel'} (string list)
  info.category = 'laptop_panel'  (string)
  info.interfaces = {'org.freedesktop.Hal.Device.LaptopPanel'} (string list)
  info.parent = '/org/freedesktop/Hal/devices/computer'  (string)
  info.product = 'Generic Backlight Device'  (string)
  info.subsystem = 'backlight'  (string)
  info.udi = '/org/freedesktop/Hal/devices/computer_backlight'  (string)
  laptop_panel.access_method = 'general'  (string)
  laptop_panel.brightness_in_hardware = true  (bool)
  laptop_panel.num_levels = 11  (0xb)  (int)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'backlight'  (string)
  linux.sysfs_path = '/sys/devices/virtual/backlight/acpi_video0'  (string)

Also, lets look in the older /proc file system for a handle. What is the output of

sudo find /proc -name brightness -print

ftornell · 2010-10-26 07:57:07

Hi,
lshal did'nt display any backlight information at all...

find /proc -name brightness -print
/proc/acpi/video/GFX0/DD05/brightness
/proc/acpi/video/GFX0/DD04/brightness
/proc/acpi/video/GFX0/DD03/brightness
/proc/acpi/video/GFX0/DD02/brightness
/proc/acpi/video/GFX0/DD01/brightness

ewaller · 2010-10-26 14:57:30

Okay, try 'cat'ing each of those files.

On my system, it looks like this:

ewaller@odin:~[1] 1002 %cat /proc/acpi/video/OVGA/DD0*/brightness
<not supported>
<not supported>
levels:  0 10 20 30 40 50 60 70 80 90 100
current: 0
<not supported>
<not supported>
ewaller@odin:~ 1003 %

Note that my card video is OVGA, whereas yours is GFX0.
On my system the interesting one is DD03.
I can set my brightness to (for example) 50% by:
echo 50 > /proc/acpi/video/OVGA/brightness

If you any of your brightness files are 'interesting' and allow you to change the brightness, then we will be able to bind the function keys to an app that will change the settings.

Arch Linux

#1 2010-10-22 06:13:27

XFCE4 and increase/decrease backlight

#2 2010-10-22 06:35:08

Re: XFCE4 and increase/decrease backlight

#3 2010-10-22 06:40:47

Re: XFCE4 and increase/decrease backlight

#4 2010-10-22 07:12:04

Re: XFCE4 and increase/decrease backlight

#5 2010-10-22 07:58:16

Re: XFCE4 and increase/decrease backlight

#6 2010-10-22 15:26:28

Re: XFCE4 and increase/decrease backlight

#7 2010-10-26 07:57:07

Re: XFCE4 and increase/decrease backlight

#8 2010-10-26 14:57:30

Re: XFCE4 and increase/decrease backlight

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