After getting the patch that was committed as part of bug 578673 and rolling back my changes to use the VESA driver I get full support for dual monitors. Everything seems to be working correct with the monitor.
My only problem now is that I can not suspend. It seems to succeed in everything but shutting down the hardware at the end.
In any case, the fix seems to fix the dual monitor problem.
After getting the patch that was committed as part of bug 578673 and rolling back my changes to use the VESA driver I get full support for dual monitors. Everything seems to be working correct with the monitor.
My only problem now is that I can not suspend. It seems to succeed in everything but shutting down the hardware at the end.
In any case, the fix seems to fix the dual monitor problem.