#!/bin/bash

# Marc Brumlik, Tailored Software Inc, tsi-inc@comcast.net
# Wed Jan  2 05:23:54 CST 2013

# newrez v 1.0
# use xrandr to scale the display to a new resolution
# rewriten to handle mouse boundaries when scaled
# this requires setting a new resolution to the unused VGA1 device
# then scaling that for B display on the LVDS1 device
# modified by Moe because he's lazy and doesn't like to type.

umask 000

# resolution can optionally be specified on command line
newrez=$1

# we MUST be running xrandr 1.3 or higher
if xrandr -v | grep "RandR version 1.[012]"
   then   zenity --info --title="XRandR version is too old" --text="You must be running Xrandr
version 1.3 or newer!
Time to upgrade your system  :-)"
      exit 0
fi

# find the currently connected devices, make a list
devices=`xrandr -q | grep connected | grep -v disconnected | cut -d"(" -f1`

# there MUST be a "connected" LVDS1 and a "disconnected" VGA1
current=`xrandr -q`

if echo "$current" | grep "LVDS1 connected" >/dev/null
   then   : OK
   else   zenity --info --title="PROBLEM" --text="Current display must be LVDS1"; exit 0
fi
if echo "$current" | grep "VGA1 disconnected" >/dev/null
   then   : OK
   else   zenity --info --title="IMPORTANT" --text="The VGA1 display resolution may be affected by this change"
fi

default=`echo "$current" | grep -A 1 "^LVDS1" | tail -1 | awk '{print $1}'`
H=`echo $default | cut -d'x' -f1`
V=`echo $default | cut -d'x' -f2`
HZ=`echo $default | awk '{print $2}' | tr -d '[*+]'`

# echo DEFAULT: $default $H $V

  title="Resolutions"
  text="Default Resolution: $default"


if [ -z "$newrez" ]
   then   while true
      do
         newrez=$(zenity --title="$title" --list \
            --height=250 --width 250 --text="$text" \
            --radiolist --column="X" --hide-column=2 --column="Resolution" --column="Screen Size" \
            TRUE    default     Default \
            FALSE   1280x800    "1280 X 800 -- 125%" \
            FALSE   1440x900    "1440 X 900 -- 140%" )
#           additional settings can be added here
#           changing the above ")" to a "\"
#           with the last one in the list ending with ")"
#           For example:
#           FALSE   1440x900    "1440 X 900 -- 140%" \
#           FALSE   4096x2400   "4096 X 2400 Maximum" )
         case $newrez in
            default|[0-9]*x[0-9]*)   break ;;
         esac
            exit 0
      done
fi

case $newrez in
   default)   xrandr --output VGA1 --auto --output LVDS1 --auto
         xrandr --output LVDS1 --mode $default --scale 1x1
         exit 0 ;;
esac

newH=`echo $newrez | cut -d'x' -f1`
newV=`echo $newrez | cut -d'x' -f2`
modeline=`cvt $newH $newV $HZ | grep Modeline`
newmode=`echo "$modeline" | sed 's/^.*"//'`
cvtrez=`echo "$modeline" | sed -e 's/_.*//' -e 's/^.*"//'`

if [ "$newrez" != "$cvtrez" ]
   then   newrez=$cvtrez
      newH=`echo $newrez | cut -d'x' -f1`
      newV=`echo $newrez | cut -d'x' -f2`
fi

scaleH=`echo -e "scale=10\n$newH / $H\nquit" | bc`
scaleV=`echo -e "scale=10\n$newV / $V\nquit" | bc`

if echo "$current" | grep -A 100 "^VGA1" | grep $newrez >/dev/null
   then   : already there
   else   xrandr --newmode "$newrez" $newmode
      xrandr --addmode VGA1 $newrez
fi

if xrandr --output VGA1 --mode $newrez --output LVDS1 --fb $newrez --scale $scaleH"x"$scaleV 2>&1 | tee -a /tmp/xrandr.err
   then   : success
   else   zenity --info --title="Xrandr produced this error" --text="`cat /tmp/xrandr.err`"

The problem could be that Your video driver
does not support xrandr version 1.3
      rm -f /tmp/xrandr.err
fi

#!/usr/bin/env xdg-open
[Desktop Entry]
Name=A lil bigger screen
Comment=Change screen resolution for a large/smaller desktop
Exec= ./bin/nxrez
Icon=preferences-desktop-theme.png
Terminal=false
Type=Application
Categories=Settings;

wadda@Baboo:~$ xrandr --prop
Screen 0: minimum 320 x 200, current 1440 x 900, maximum 32767 x 32767
LVDS1 connected 1440x900+0+0 (normal left inverted right x axis y axis) 223mm x 125mm
   EDID:
      00ffffffffffff004ca34e5500000000
      0012010380160d780a859599574f8f26
      21505400000001010101010101010101
      010101010101f8160094415856201888
      3600df7d000000190000000f00000000
      00000000001eb4027400000000fe0053
      414d53554e470a2020202020000000fe
      003130314e5430322d4130340a2000ad
   BACKLIGHT: 9 (0x00000009)   range:  (0,9)
   Backlight: 9 (0x00000009)   range:  (0,9)
   scaling mode:   Full aspect
      supported: None         Full         Center       Full aspect
   1024x600       60.0*+
   800x600        60.3     56.2 
   640x480        59.9 
VGA1 disconnected 1440x900+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x800       59.8 
   1440x900       59.9*
wadda@Baboo:~$