I'm also having the problem.  Dell inspiron 1520, nVidia 8400m graphics.

lshal -m

Start monitoring devicelist:
-------------------------------------------------
21:13:27.339: computer_logicaldev_input_4 property button.state.value = true
21:13:27.344: computer_logicaldev_input_4 condition ButtonPressed = lid
21:13:34.638: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = play-pause
21:13:37.477: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = play-pause
21:13:38.604: computer_logicaldev_input_4 property button.state.value = false
21:13:38.612: computer_logicaldev_input_4 condition ButtonPressed = lid

The screen stays off as long as i don't press anything, but it comes
back on when i press the play pause button, but obviously the system
detects the lid being opened much later.

If I run "xset dpms force off", the screen will turn off but come back
on if i press anything.

-- 
closed Laptop Lid to reliably keep Backlight off
https://bugs.launchpad.net/bugs/41994
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