Lidbtn ACPI event never triggered, backlight doesn't turn off

[speaker219]

I'm having a problem with my laptop lid in Ubuntu 9.04. The lidbtn event is never triggered when the lid is closed. /proc/acpi/button/lid/LID0/state reports the proper states (open or closed), but the lid.sh script is never executed.

My laptop is a Dell Studio 1555.

I can confirm this because my backlight does not turn off when I close my lid, but if I have this running:

while [ 1 ]; do /etc/acpi/lid.sh; sleep 1; done

The backlight turns off when the lid is closed, and back on when I open it. Any ideas? making me crazy :[

[rengolin]

Same problem here... Dell studio 1555.

Can you make your laptop to suspend? Did you install kernel 64-bit?