xbacklight on intel

[Jesse Barnes]

On Tuesday, November 27, 2007 8:08 am Khashayar Naderehvandi wrote:
> > What does 'xrandr --prop' report when you're running the 2.2 driver?
>
> This is what I get:
>
> khashayar at dionysos ~ $ xrandr --prop
> Screen 0: minimum 320 x 200, current 1280 x 768, maximum 1280 x 1280
> VGA disconnected (normal left inverted right x axis y axis)
> LVDS connected 1280x768+0+0 (normal left inverted right x axis y axis) 0mm
> x 0mm
>         BACKLIGHT_CONTROL: native
>                 supported: native       legacy       combination
> kernel
>         BACKLIGHT: 0 (0x00000000) range:  (0,0)
>    1280x768       59.2*+   85.0     75.0     70.0     60.0
>    1280x720       85.0     75.0     70.0     60.0
>    1152x768       54.8
>    1024x768       85.0     75.0     70.1     60.0
>    832x624        74.6
>    800x600        85.1     72.2     75.0     60.3     56.2
>    640x480        85.0     72.8     75.0     59.9
>    720x400        85.0
>    640x400        85.1
>    640x350        85.1
> TMDS disconnected (normal left inverted right x axis y axis)

So your machine is defaulting to the native register interface.  I wonder if 
it should be using the legacy interface instead?  Can you try
  $ xrandr --output LVDS --set BACKLIGHT_CONTROL legacy
and see if xbacklight works for you then?

Jesse