I'm running 7.10 beta Gutsy Gibbon and experiencing this problem on my Sony 
Vaio VGN-N250e. I can't change brightness through gnome-power-manager or the 
brightness applet. I have changed the above mentioned files to /bin/bash from 
/bin/sh but to no avail. I can still change the brightness by manually writing 
to the /sys/class/backlight/sony/brightness file... I have to chown the file 
first and then echo 1-8 to the file and it works. Would like it to work through 
gnome, however.
It did work for a short period of time but after a recent update (on October 4) 
it stopped working again.

-- 
bashism in hal-system-lcd-get-brightness-linux
https://bugs.launchpad.net/bugs/68617
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