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[Volkan Gezer <568611@xxxxxxxxxxxxxxxxxx>]

Hello,

I am using 3.8.0.26 on Kubuntu 13.04 (KDE) Samsung Laptop and currently
using "acpi_osi=Linux acpi_backlight=vendor" to enable backlight
control. Whenever I log off, the controls are disabled again and I need
to run intel_backlight. Another problem is power profiling. Whatever I
set dimming and/or backlight off durations. It automatically turns it
off in 5 minutes (even I totally disable it).

 Do you have any idea why the problem is still not solved?

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558

Status in “alsa-driver” package in Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  Attempts (on a current Lucid beta) to control the screen brightness on
  my Dell Studio 1558 fail with the following errors reported in dmesg:

   [ 1162.236365] ACPI: Failed to switch the brightness
   [ 1162.379144] ACPI: Failed to switch the brightness
   [ 1162.538226] ACPI: Failed to switch the brightness
   [ 1162.667358] ACPI: Failed to switch the brightness
   [ 1162.784171] ACPI: Failed to switch the brightness

  This is true both for the keyboard's brightness controls (Fn-F4,
  Fn-F5) and for a gnome-brightness-applet on the panel.

  Output of acpidump, dmesg and lspci is attached.

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