[Bug 232464] Re: Make script for changing backlight using xbacklight on VAIO laptop

[Launchpad Bug Tracker]

[Expired for acpi-support (Ubuntu) because there has been no activity
for 60 days.]

** Changed in: acpi-support (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/232464

Title:
  Make script for changing backlight using xbacklight on VAIO laptop

Status in “acpi-support” package in Ubuntu:
  Expired

Bug description:
  Binary package hint: acpi-support

  I have Sony Vaio laptop version VGN-FZ210C. It comes with  Intel
  Corporation Mobile GM965/GL960 Integrated Graphics Controller, also
  called X3100 on selling materials. Ubuntu has several way to control
  brighness, but most are ACPI or some laptop-specific driver based.
  Several Vaios have ACPI driven support. But mine does not. I believe
  every computer with X3100 is able to control brighntess using intel
  driver for that card. Using extension i can control backlight using
  xbacklight utility coming from xbacklight package (not in default
  ubuntu install).

  I am able to map right fn key to right script, but there is none
  working. I believe it could be reused for other laptops with intel
  X3100 graphics as well, so it wont work only with sony.

  Problem with xbacklight is that it needs access to X DISPLAY, as it
  does it via X11 extension. If ubuntu could configure mapping some
  global keys to userspace and it had prepared mappings for right keys,
  it might be possible to map it like XF86Play keys are in metacity. So
  metacity does not have such mapping in their hotkeys setup also. So,
  if it is doable, make also xbacklight working from acpi events.

  It would be nice if sonybright.sh checked existence of files it is using. 
  It does read or write file /sys/class/backlight/sony/brightness, but it does not check if it does even exist. It is making error messages to log only that way. As not all VAIOs have same method of configuring backlight, it might be wise check before reading it.

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