Yes, there is really an issue with the lid state.

If 
cat /proc/acpi/button/lid/LID/state
always returns:
state: closed
whether laptop is closed or open, you have an acpi bug...

But g-p-m NEVER does dpms on when lid state = closed.
The bug is fixed in g-p-m 2.17.1, where you're able to set a gconf-key to make 
it work.

-- 
g-p-m failing to use DPMS to power off display
https://launchpad.net/bugs/34233

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