i have the same bug on ubuntu karmic on my nc10

i found only one solution to change brightness with KMS,

first : find the device address (here 00:02.0)
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express 
Integrated Graphics Controller (rev 03)

second :
setpci -s 00:02.0 F4.B=66 (a value between 00 and FF, where FF is 100%)


but this solution is not as simple as brightness keys, brightness applet, or 
even xbacklight !

the only possibility for me to made the brightness work, was disabling
KMS with "nomodeset" as kernel parameter

i hope a fix will come out to use both brightness and KMS

-- 
Unable to adjust brightness (KMS bug)
https://bugs.launchpad.net/bugs/388216
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