hp elitebook 6930p 11.2 off switch not functional


i just installed 11.2 on my friends elitebook 6930p.
pretty much everything seems to work fine. the only thing i really miss is a working off switch. its so cool when you just have to press the off switch and the notbooks goes to suspend to disk or is shutting down.

however on this elitebook nothing happens when i press the offswitch. i checked the settings in kde4 powermanagement and its set to shutdown.

any idea why this is not working?

thx a lot!