I'm writing from a live session (so whitout nvidia rstricted drivers) of ubuntu 
intrepid ibex beta version (downloaded yesterday)...
No way of changing the brightness of my sony vaio vgn-nr31S...

I report some of the trials i did:

[EMAIL PROTECTED]:/etc/acpi/events$ sh sony-brightness-down
sony-brightness-down: 3: SPIC: not found
sony-brightness-down: 4: down: not found

xbacklight -set 50
No outputs have backlight property

 /etc/acpi/sonybright.sh down
cat: /sys/class/backlight/sony/brightness: No such file or directory
/etc/acpi/sonybright.sh: line 8: [: : integer expression expected
/etc/acpi/sonybright.sh: line 15: /sys/class/backlight/sony/brightness: No such 
file or directory

Hope this will help somebody to fix this bug...

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No Screen Backlight Control; Sony Vaio with nvidia 8 series graphics
https://bugs.launchpad.net/bugs/95444
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