HP 6510b freeze when I close the monitor

Hi,
I have a problem with a laptop HP 6510b [1] on which I installed KDE 4.3, that freeze most of the time I close the monitor. In the System Settings I excluded any action following the monitor closure.
Moreover if I close the monitor durign the shutdown, after the DE is closed, the latop also freeze with a lot of kernel crash messages.
Anybody has an idea of how to trace the problem?
Thanks in advance
Jimmi
[1]http://search.hp.com/query.html?search=++&qt=6510b

jimmi wrote:
This works for me too thanks hw-tph! And also has the side effect to work when resuming from suspend, before it was not
I have a couple of questions, if I may. Do you know who and when is creating the file during the boot sequence? I still wonder why before it was working and now not anymore.
The kernel devs changed the setting, causing the hangup. I thought I had a link to it somewhere (I owned a 6510b before) but I seem to have lost it, if you want to get dirty, I think it was this kernel commit.
Second, in the ArchWiki it is written that the acpid daemon could be left out from the DAEMONS line because it is triggered by the hal daemon, that works for me.
If I'm not mistaken calling HAL will make HAL start dbus if it isn't running yet - but not the acpid daemon.

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