Comment 10 for bug 428054

The backlight property only shows up when using nomodeset. I can us it to control the backlight then but it's still missing even with the latest updates and KMS enabled.

$ dpkg-query -s xserver-xorg-video-intel
Package: xserver-xorg-video-intel
Status: install ok installed
Priority: optional
Section: x11
Installed-Size: 1588
Architecture: amd64
Version: 2:2.9.0-1ubuntu1

$ xrandr --prop
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
 EDID_DATA:
  00ffffffffffff0030e4020200000000
  00130103802313780a28659759548e27
  1e505400000001010101010101010101
  010101010101561d56c6500020303020
  350059c2100000190000000000000000
  00000000000000000000000000fe004c
  4720446973706c61790a2020000000fc
  004c503135365748332d544c41310039
 scaling mode: Fullscreen
  supported: Non-GPU Fullscreen No scale Aspect
   1366x768 60.0*+
   1360x768 59.8
   1024x768 60.0
   800x600 60.3
   640x480 59.9
DVI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)