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f33e652
(Get the code!)
I have the same problem with 10.04 Beta on the N150.
A workaround is to create a file called brightness.sh somewhere with this content:
#!/bin/sh
sudo setpci -s 00:02.0 F4.B=$1
Then just execute: chmod a+x brightness.sh
After that you can execute brightness.sh with a hex number between 0 (off) and ff (full brightness) like this:
./brightness.sh 50
This is kind of ugly but it is much better than not being able to change brightness at all.
I'm not an expert on kernel and X dirvers but for me the problem seems to be that the X driver doesn't support the xrandr brightness property. If I call xrandr --verbose on the N150 this property doesn't appear while it is present if I execute the same command on a machine where changing the brightness with the gnome panel applet works.