[Bug 338733] [NEW] Unable to adjust of brightness on Tabletkiosk Sahara TouchIT-213 Tablet PC

[claudio]

Public bug reported:

I can change the brightness using this command:

sudo  bash -c 'echo 128 >/sys/class/backlight/kb3886-bl/brightness'

i.e. by writing values in the range 0..255 into
/sys/class/backlight/kb3886-bl/brightness

but changing it with xbacklight, e.g. with

sudo xbacklight -set 50

does not work.

This is how hal reports about the backlight driver (full lshal output
attached):

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.num_levels = 256  (0x100)  (int)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'backlight'  (string)
  linux.sysfs_path = '/sys/devices/platform/kb3886-bl/backlight/kb3886-bl'  (string)

udi = '/org/freedesktop/Hal/devices/platform_kb3886_bl'
  info.linux.driver = 'kb3886-bl'  (string)
  info.parent = '/org/freedesktop/Hal/devices/computer'  (string)
  info.product = 'Platform Device (kb3886-bl)'  (string)
  info.subsystem = 'platform'  (string)
  info.udi = '/org/freedesktop/Hal/devices/platform_kb3886_bl'  (string)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'platform'  (string)
  linux.sysfs_path = '/sys/devices/platform/kb3886-bl'  (string)
  platform.id = 'kb3886-bl'  (string)

$ lsb_release -rd
Description:	Ubuntu jaunty (development branch)
Release:	9.04

$ apt-cache policy xbacklight linux 
xbacklight:
  Installed: 1.1-1
  Candidate: 1.1-1
  Version table:
 *** 1.1-1 0
        500 http://ch.archive.ubuntu.com jaunty/universe Packages
        100 /var/lib/dpkg/status
linux:
  Installed: 2.6.28.8.8
  Candidate: 2.6.28.8.8
  Version table:
 *** 2.6.28.8.8 0
        500 http://ch.archive.ubuntu.com jaunty/restricted Packages
        100 /var/lib/dpkg/status

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

-- 
Unable to adjust of brightness on Tabletkiosk Sahara TouchIT-213 Tablet PC
https://bugs.launchpad.net/bugs/338733
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