So, the two monitors have very different geometry.
I'm configured with Xinerama.
If I tell compiz to turn on, both screens go gray and stay that way until I blast out of X and edit the XML file (I use XFCE4) to turn off compiz again. Nothing is visible except the occasional flicker.
I'm seeing a far worse variation on the theme.
Dell M1330. That has an Nvidia 8400M GS.
Plugged into the DVI port, a Dell 2407WFP.
So, the two monitors have very different geometry.
I'm configured with Xinerama.
If I tell compiz to turn on, both screens go gray and stay that way until I blast out of X and edit the XML file (I use XFCE4) to turn off compiz again. Nothing is visible except the occasional flicker.