Wow, long bug. Hope I didn't miss something obvious. I have a Vaio VGN-
CR120E with the " Integrated Graphics Chipset: Intel(R) 965GM" chip set
and have always (since at least Hardy beta) been able to adjust the
brightness with the following two command lines (although hotkeys have
never worked):

sudo /etc/acpi/sonybright.sh up
sudo /etc/acpi/sonybright.sh down

Not sure how I discovered this workaround for the keys, but in release
Hardy someone tipped me off that I could use the panel gnome-brightness-
applet which gave me an acceptable solution. Unfortunately that is now
broken in Intrepid and I'm back to terminal to adjust my screen
brightness :-( https://bugs.launchpad.net/ubuntu/+source/gnome-power-
manager/+bug/243904 ).

Anyway, hope this bit of information might be helpful to others.

-- 
Unable to adjust screen brightness on recent Sony Vaio notebooks, Intel GMA 
adapter
https://bugs.launchpad.net/bugs/173652
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