resolution - Why is there no 20" HP LCD information in Raring?

My HP S2031 is limited to 1024x768 max.

I have spent hours tracking this down.
I've installed a new driver and had to remove it because it broke Unity.
I read about the amdconfig command, which is not on my system.
I learned about the xrandr & cvt functions and attempted to use them with no change.
xrandr --newmode "1600x900R" 97.50 1600 1648 1680 1760 900 903 908 926 +hsync -vsync

Using grep I found the file /usr/share/hwdata/MonitorsDB,
and I have determined that my monitor is not on the list.
In fact, there are no 20" 1600x900 native resolution HP brand LCDs in the file!

Within the "Displays" application the monitor is listed as Unknown.
Is this the reason for the lack of proper graphics driver?
Why my monitor can only be set to display a distorted 1024x768 or 800x600?

Does anyone know the format of the data to add to this MonitorsDB file, and would it work?

My system's output from cvt -r 1600 900 (what I used) is shown above.
cvt 1600 900 yields:
# 1600x900 59.95 Hz (CVT 1.44M9) hsync: 55.99 kHz; pclk: 118.25 MHz
Modeline "1600x900_60.00" 118.25 1600 1696 1856 2112 900 903 908 934 -hsync +vsync

gtf 1600 900 60 yields:
# 1600x900 @ 60.00 Hz (GTF) hsync: 55.92 kHz; pclk: 119.00 MHz
Modeline "1600x900_60.00" 119.00 1600 1696 1864 2128 900 901 904 932 -HSync +Vsync

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EDIT:

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To fix no 1600x900 resolution for HP 20" monitor, I created /usr/local/bin/fix-resolution.sh containing these four lines
#!/bin/sh
xrandr --newmode "1600x900R" 97.50 1600 1648 1680 1760 900 903 908 926 +hsync -vsync
xrandr --addmode VGA-0 1600x900R
xrandr --output VGA-0 --mode 1600x900R
These xrandr changes will disappear on reboot, so I made the script executable and then created the file /etc/xdg/autostart/fix-resolution.desktop containing these 4 lines
[Desktop Entry]
Name=fix resolution
Exec=/usr/local/bin/fix-resolution.sh
NoDisplay=false
to automatically execute the script on startup.
The fix-resolution.sh script works when executed from the terminal after startup,
but does not automatically run during startup. I assume that this is not the proper place to ask a question about the startup sequence, I'm just letting you know what is needed to fix this problem in case anyone else has it too.