[Bug 428054] Re: xrandr backlight property control missing (when using KMS?)

[Matti Viljanen]

Confirming on Acer Aspire 2920 w/ Intel 965GM, Karmic up-to-date.

When using Fn-Left or Fn-Right to adjust brightness, the bar on the
screen moves, but display does not change. *).

Running "xorg --prop" is missing backlight control. However:

me at acer:/proc/acpi/video/GFX0$ cat DD0[1-5]/brightness
<not supported>
<not supported>
levels:  10 20 30 40 50 60 70 80 90 100
current: 60
<not supported>
<not supported>

So, DD01, DD02, DD04 and DD05 claim not to support backlight, but DD03
does.

*) The brightness DOES change, when trying to reduce brightness when
/proc/acpi/video/GFX03/brightness is already at minimum (10), or when
trying to increase brightness when the bar it's at maximum (100). Then
brightness changes to dim or bright. Is that really minimum and maximum
brightness, I really can't tell...

-- 
xrandr backlight property control missing (when using KMS?)
https://bugs.launchpad.net/bugs/428054
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