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[trendzetter <joris.willems@xxxxxxxxx>]

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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