I have this same bug on a Dell L400. I'm not sure this is being classified as a 
kernel ACPI bug since ACPI appears to be behaving correctly; the 
/proc/acpi/button/lid/LID0/state file is going true and false.
But I maybe totally in the dark about what the parts are doing.

hal, upon which acpid is depending for notifications, is not seeing this event.
It seems like we have switched paradigms for noticing these events and some of 
the laptops have been left in the dust.   What is the tie between kernel states 
of acpi devices and hal notifications?  Is this kernel work or hal work? Is hal 
in the kernel.   This bug and others like it are numerous in ubuntu land.  
Would more data help?  I can submit the same files as above, but they are no 
more interesting.

Thanks for all you do!
Gerry
(I have the added problem that once a minute hal notifies me (and acpid) that 
my sleep button is being pressed when it is not.  When I DO press it, it 
notifies me then too.)

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Laptop lid close button dosen't work
https://bugs.launchpad.net/bugs/177129
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