debian-6.0.7-amd64 how to set resolution and refresh for free NVIDIA X drivers?

[David Christensen <dpchrist@holgerdanske.com>]

debian-user:

I have an Asus M2NPV-VM motherboard with integrated NVIDIA GeForce 6150 
graphics and a fresh install of debian-6.0.7-amd64, XFCE desktop, and 
xdm display manager.  The display seems to be running at 1024x768 @ 60 Hz.

I booted in recovery mode and ran:

    # Xorg -configure

which created /root/xorg.conf.new.  But when I try to use that file, X 
hangs when starting.

I have used the proprietary NVIDIA driver in the past, but would like to 
use the free Debian drivers instead.

1.  I can determine the current resolution and refresh via Start -> 
System -> Preferences -> Monitors, but I cannot change those settings.

2.  How do I determine the current color depth (e.g. 8/16/24 bits per 
pixel)?

3.  How do I change the display settings -- resolution, refresh, color 
depth?


TIA,

David