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[Stefan Glasenhardt <stefan@xxxxxxxxxxxxxxx>]

Public bug reported:

Hi,

Since a quite a while backlight management on my notebook (Dell Latitude
D830) is quite broken. It started when a patch to manage the backlight
in the kernel intel-driver was introduced.

Here is the deal:

My notebook normally uses the kernel interface "dell_backlight". This
worked perfectly until the above patch was introduced. New gsd-
backlight-helper chooses "intel_backlight" as the standard interface.
When using this, i can still control the backlight but because
"intel_backlight" assumes 255 steps instead of the correct 7 steps of
"dell_backlight", "gnome-settings-daemon" can't correctly set and get
the values.

After patching the file "gsd-backlight-helper.c" (Adding "dell_backlight
as an additional kernel-interface) the backlight management is back to
normal. Please see the attachment for more details.

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/862474

Title:
  Backlight control for "dell_backlight" is missing in gsd-backlight-
  helper

Status in “gnome-settings-daemon” package in Ubuntu:
  New

Bug description:
  Hi,

  Since a quite a while backlight management on my notebook (Dell
  Latitude D830) is quite broken. It started when a patch to manage the
  backlight in the kernel intel-driver was introduced.

  Here is the deal:

  My notebook normally uses the kernel interface "dell_backlight". This
  worked perfectly until the above patch was introduced. New gsd-
  backlight-helper chooses "intel_backlight" as the standard interface.
  When using this, i can still control the backlight but because
  "intel_backlight" assumes 255 steps instead of the correct 7 steps of
  "dell_backlight", "gnome-settings-daemon" can't correctly set and get
  the values.

  After patching the file "gsd-backlight-helper.c" (Adding
  "dell_backlight as an additional kernel-interface) the backlight
  management is back to normal. Please see the attachment for more
  details.

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