Screensaver killed by some applications

I'm running Debian Testing with KDM/KDE.

If I run Qemu it stops the screensaver from working and the only way I've found to get it working again is to stop and re-start X after I have closed Qemu.

Anyone else have this?

Is there a better way to restart the screensaver? I have tried resetting it in the KDE Control Centre but although screen blanking works power off of the screen after a set time does not work.

I have seen this happen occasionally when I'm not running Qemu and I suspect another application but I haven't been able to identify it yet.

Regards

-- 
Barry Samuels
http://www.beenthere-donethat.org.uk
The Unofficial Guide to Great Britain