Works for my HP compaq nc6000
Though my command is slightly different:
echo 1 > /proc/acpi/video/C0CF/DOS
echo 0 > /proc/acpi/video/C0CF/DOS

My current system is:
Ubuntu 10.04.2 LTS
2.6.32-28-generic

According to the thread mentioned in previous post the problem could be caused 
by the patch
"linux-2.6-acpi-video-dos.patch". Not sure if it is present in ubuntu patches.

-----------------------------------------------------
Alexei Panov 2010-03-04 17:42:54 EST

I have found a patch which breaks operation of Lid Switch on HP Mini 5101, and
possible on others HPs. 
This patch is linux-2.6-acpi-video-dos.patch. If you build a kernel without
this patch lid switch perfectly works.
I suggest to test for those who have such problem, I have made a variant of a
kernel without the offending patch ftp://ftp.atisserv.ru/kernel-hp-lid/
-----------------------------------------------------

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https://bugs.launchpad.net/bugs/89860

Title:
  /proc/acpi/button/lid/*/state always says "open"

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