laptop dock/undock

gistfile1.sh

#!/bin/sh

# not sure what dock.0 is, but dock.1 seems to be the right one.
DOCKED=$(cat /sys/devices/platform/dock.1/docked)
case "$DOCKED" in
    "0")
        #undocked event
        xrandr --output LVDS1 --auto --primary
        ;;
    "1")
        #docked event
        # Get each display name and whether it is connected/disconnected
        displays=$(xrandr -q | grep ' connected' | cut -d ' ' -f1)
        xrandr --output LVDS1 --off
        prev=
        for x in HDMI3 HMDI2; do
            if echo $displays | grep -q $x; then
                if [ -z $prev ]; then
                    xrandr --output $x --auto --primary
                else
                    xrandr --output $x --auto --right-of $prev
                fi
                prev=$x
            else
                xrandr --output $x --off
            fi
        done
        ;;
esac

$ xrandr -q
Screen 0: minimum 320 x 200, current 5440 x 1080, maximum 32767 x 32767
LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
1600x900 60.0_+
1440x900 59.9
1360x768 59.8 60.0
1152x864 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected primary 1920x1080+3520+0 (normal left inverted right x axis y axis) 510mm x 287mm
1920x1080 60.0_+
1680x1050 59.9
1280x1024 75.0 60.0
1440x900 75.0 59.9
1280x800 59.9
1152x864 75.0
1024x768 75.1 70.1 60.0
800x600 72.2 75.0 60.3
640x480 72.8 75.0 60.0
720x400 70.1
HDMI3 connected 1920x1080+1600+0 (normal left inverted right x axis y axis) 510mm x 287mm
1920x1080 60.0*+
1680x1050 59.9
1280x1024 75.0 60.0
1440x900 75.0 59.9
1280x800 59.9
1152x864 75.0
1024x768 75.1 70.1 60.0
800x600 72.2 75.0 60.3
640x480 72.8 75.0 60.0
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)