Initially I could not get the system to run at the 1680x1050 native resolution of the monitor due to Solaris bug 6362624. Apparently this is fixed in patch 118717
although I ended up using the work-around from the bug report (add an entry to
/etc/openwin/server/etc/OWconfig and run
fbconfig). This worked great and I'm now running at 1680x1050.