Bug#452894: Brightness is reduced when switching to a VT, using 3d games or switching resolution

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

Diego Escalante Urrelo wrote:
> I just got the bug again, here's the output:
>
> diego@milkyway:~$    xrandr --prop
> Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1024 x 1024
> VGA disconnected (normal left inverted right x axis y axis)
> LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
>         BACKLIGHT_CONTROL: kernel
>                 supported: native       legacy       combination  kernel
>   

That's why you need thinkpad-acpi loaded, the X driver uses the "kernel"
interface.

Brice