I found what may lead to a solution: using vbetool instead of xset seems to 
ignore input.
instead of running 
xset dpms force off, 
using
sudo vbetool dpms off 
will turn off the display and not turn on unless I close the lid(invoking the 
default screen blanker) and then move the mouse, press a button or something 
else.

I don't have time right now to make a replacement lid.sh, but I'll post
one asap(if I can somehow call sudo without a password prompt... oh
yeah, i can mod whatever sudo file to allow vbetool), and later maybe
look at the source code in order to get a real fix.

Working on an Inspiron 1520 with an nVidia 8600m GT, proprietary drivers

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