I have an aspire timeline with intel grafics running the latest daily build
karmic.
I am unable to control brightness except for the method explained in comment #2
(setpci -s 00:02.0 F4.B=66)
When running xrandr --prop it does not have support for backlight control:
# 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)
$ xbacklight -time 0 -set 20
No outputs have backlight property
--
brightness no more working on karmic (KMS)
https://bugs.launchpad.net/bugs/397617
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