Leann, I think this should re-opened and tagged as affecting Jaunty.

It is (still) not possible to control the back-light on the Vaio VGN-
FE41Z with Nvidia GeForce Go 7600 without my smartdimmer workaround (I
need to build a new package for Jaunty and put it in my PPA).

lspci -nn -s:01:00.0
01:00.0 VGA compatible controller [0300]: nVidia Corporation G70 [GeForce Go 
7600] [10de:0398] (rev a1)

Although the sony-laptop module's control nodes can be written to they
have no effect. Here's the output after reducing the brightness from 7
to 5 (no actual visual effect):

for node in /sys/class/backlight/sony/*; do [ -f $node ] && echo "$node = $(cat 
$node)"; done
/sys/class/backlight/sony/actual_brightness = 5
/sys/class/backlight/sony/bl_power = 0
/sys/class/backlight/sony/brightness = 5
/sys/class/backlight/sony/max_brightness = 7
/sys/class/backlight/sony/uevent =

-- 
no brightness control in sony vaio vgn-fe31b
https://bugs.launchpad.net/bugs/115525
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