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[gagzou <gagzou@xxxxxxxxx>]

Just add the acpi_backlight=vendor (grub) and put in
/etc/X11/xorg.conf.d/80-backlight.conf :

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "Backlight"       "intel_backlight" # use your backlight that works here
EndSection

ArchWiki:
https://wiki.archlinux.org/index.php/Backlight

Kernel 3.12.6-1 (x86_64) under Archlinux, xorg-server 1.14.5-2

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https://bugs.launchpad.net/bugs/606547

Title:
  toshiba_acpi no control of display backlight after suspend to ram

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  Hello-
  toshiba portege r705

  After boot, display backlight control works fine.
  After suspend to ram (any number of times), backlight control does not work
  After suspend to ram, wake, suspend to disk, wake backlight control returns to working state.

  When control is not working, on screen display does work -- indicating backlight changing brightness (even though its not)
  /proc/acpi/toshiba/lcd changes with button pushes, as expected
  /sys/devices/platform/toshiba_acpi/backlight/toshiba/actual_brightness changes with button pushes, as expected
  however--
  /sys/devices/platform/toshiba_acpi/backlight/toshiba/brightness never changes from 0, even from a fresh boot.

  Additionally, the max_brightness=7 and the count starts at 0, but there are only 5 levels when adjusting using control buttons.  And even more oddly, when increasing from 0, display_brightness goes like this:
  0,2,4,6,7
  And when decreasing from 7, it goes like this:
  7,5,3,1,0.

  Although i think this needs to be filed against a different component,
  (suggestions?) i thought it might be valid here as well.

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