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[Launchpad Bug Tracker <1012743@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gnome-settings-daemon (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1012743

Title:
  Unable to adjust backlight brightness

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

Bug description:
  Hi,

  gsd-backlight-helper seems to make a wrong decision on which backlight
  to modify/the correct node is missing. The hotkeys for changing the
  screen brightness don't work on MacBook Air using nouveau.

  gsd-backlight-helper sets
  /sys/devices/virtual/backlight/apple_backlight/brightness which
  doesn't change anything.

  manually setting the brightness like this

  # echo 15 > /sys/class/backlight/nv_backlight/brightness

  works well

  Package: gnome-settings-daemon           
  State: installed
  Automatically installed: no
  Version: 3.4.2-0ubuntu0.1

  leaf# strace ./gsd-backlight-helper --set-brightness 15 2>&1 | tail
  open("/sys/devices/virtual/backlight/apple_backlight/type", O_RDONLY|O_CLOEXEC) = 4
  read(4, "platform\n", 4096)             = 9
  close(4)                                = 0
  close(3)                                = 0
  getuid()                                = 0
  geteuid()                               = 0
  open("/sys/devices/virtual/backlight/apple_backlight/brightness", O_WRONLY) = 3
  write(3, "15", 2)                       = 2
  close(3)                                = 0
  exit_group(0)                           = ?

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