I have the same symptoms with my NC6000 and 9.04
performing: "cat /proc/acpi/button/lid/C138/state"
with lid closed and open produces the same output, which is "state:    open"

"acpi_listen" does not seem to work well in detecting the lid switch changes - 
almost as if it is delayed.
If I push the lid button many times, no event is seen for a long while, unless 
I trigger something else - such as unplug the power - then the lid button 
messages appear!
Nevertheless, the screen stays on.

The lid switch & backlight on/off works until gdm loads.

Booting into the recovery mode...
The backlight works, and performing the same "cat" test above shows correct 
"open" and "closed" states.
"acpi_listen" displays the changes immediately.

I suspect gnome-power-manager or something intercepts the lid switch
signal and "drops" it or something.

-- 
/proc/acpi/button/lid/*/state always says "open"
https://bugs.launchpad.net/bugs/89860
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