Comment 12 for bug 449188

This bug affects me also, on a Dell Latitude D820 running Jaunty. I had the same problem in Karmic, but this plus other bugs prompted me to return to Jaunty for now.

When I was using Karmic, I tried Michal's suggestion:

if [ `CheckPolicy` == 0 ]; then exit; fi

but that caused my external monitor on my port replicator to blank as well. That's definitely not the desired behavior--I'd like the laptop display to blank and keep the external display enabled.

Other potentially useful info:
-In Jaunty, I have gnome-power-manager set to suspend when on battery when the lid is closed. It works well, consistently. In Karmic it sometimes failed.
-I'm using Nvidia driver 180 (was using 185 in Karmic).
-I have gnome-power-manager installed, but NOT gnome-screensaver. I've installed a real screensaver (xscreensaver). I tried enabling display power management in xscreensaver, and the screen blanked when the lid was closed. I'm not sure what the effect of this is on an external monitor. I don't think this worked in Karmic, though. However, xscreensaver power management doesn't seem as full-featured as gnome-power-manager, and I'm afraid to keep both enabled.
-I am using Compiz.

-Brian