I've recently noticed that one of our lab laptops running "testing" and "unstable" <strong>freezes</strong> the system whenever i close
the lid.

Additionally, X does not always come up properly and rebooting is (besides typing blindly) the only way to get a
graphical login. The graphics chipset is an intel 955.

After a bit of search we found a kernel bugreport, which provides a clue
where the problem occurs.

root@orion:~# cat /proc/acpi/video/*/DOS
DOS setting: <0>

To get it working for the HP Compaq 2510p, all you need to do is to set a value of "1"

root@orion:~# echo '1' > /proc/acpi/video/*/DOS

Then cross your fingers and close the lid.

Hopefully your system did no freeze and is still up ;-)

At work, we're using a modprobe post-install-Script to work around this which sets the working ACPI _DOS value if a ''ACPIvideo_DOS'' variable is set. This will hopefully be fixed soon in a newer kernel version.

Afaik from Debconf8, Bdale also owns one of those notebooks.

PS.: *rofl*