Automatic multi-monitor config via xrandr.

automon.sh

#!/bin/sh
# automon.sh -- automatically configures multiple monitors.
#
# I use this script on Arch Linux.  This handles my personal monitor setup more
# correctly and robustly than either Ubuntu or Windows 7, however it is only
# designed to work on my laptop.
#
# On that laptop it always calls "xrandr" using the exactly the same arguments.
# The --auto option in xrandr is clever enough to do the rest.  One day this
# script might become more flexible.
#
# My laptop is a Lenovo G550 (Model name = 2958).
#


# This gets a list of the form "LVDS1 VGA1 HDMI1 DP1 DP2" -- apparently every
# monitor that the graphics card believes it might theoretically have --
# including the disconnected ones.
OUTS=`xrandr \
        | awk '/^[[:alnum:]]+ (dis)?connected/ {print echo $1}' \
        | sort`

# LVDS1 is the laptop's built in screen and is therefore different.
OUTP="xrandr --output LVDS1 --auto"
OLD=LVDS1

for OUT in $OUTS
do
        # skip the monitor we already configured.
        [ "$OUT" == "LVDS1" ] && continue
        OUTP="$OUTP --output ${OUT} --auto --left-of $OLD"
        #OLD=$OUT

        # Since not every monitor can be to the (direct) left of LVDS1, I
        # wanted to use $OLD to define a nice linked list.  Sure, some of the
        # monitors don't exist, but xrandr seems to treat them as 0x0 in size,
        # which seems smart to me.  Sadly X often crashes when I try this, so
        # instead $OLD is always $LVDS1.  I suspect this will cause crashes if I
        # ever plug more than two monitors in.
done

echo ${OUTP[*]}

Thanks man. Works like a charm after changing the default screen name.