Hi Jerry.  From within xterm, please post the result of:
xrandr --verbose

>From outside of xterm, like via SSH or serial console, this works on 
BBB-provided Angstrom to allow xrandr to connect to the X server (probably 
different on Raspbian):
export XAUTHORITY=`ls /var/run/gdm/auth-for-root-*/database`
export DISPLAY=:0.0
xrandr --verbose

 

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