My original report was mistaken.  Even with the latest linux image
(linux-image-2.6.22-11-generic 2.6.22-11.33) I can change the LCD
brigthness using the gnome applet only when I boot using AC power.  If I
start the computer and run on batteries, I cannot change the brightness.
In the kernel log there is a statement about the "hal acpi add-on"
having crashed.  I can change the brightness by echoing a value in
/proc/acpi/video/VID/LCD0/brightness.

Note that even with the current kernel (2.6.22-11.33), there are still
two "VID" entries in /proc/acpi/video.

Also, changing the the current brightness using the applet is not
reflected in the /proc entry.

-- 
2.6.22-11-generic has two entries in /proc/acpi/video/
https://bugs.launchpad.net/bugs/138452
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