Acer Monitor Resolution

Here’s how I resolved the issue I had with Ubuntu not detecting the full 1680×1050 resolution of my Acer 2016W monitor. First, I obtained several numbers from ddcprobe by entering the following from the command line:

sudo /usr/sbin/ddcprobe

ddcprobe is a part of xresprobe package, which can be intalled either via Synaptic Package Manager or apt-get.
The command yielded the frequency settings for the monitor, which in my case were

Horizontal Sync (kHZ): 31-84
Vertical Sync (HZ) : 56-44

I then opened /etc/X11/xorg.conf:

sudo gedit /etc/X11/xorg.conf
added a new Monitor section following the existing Monitor section and used the values from ddcprobe:

Section "Monitor"
Identifier "Acer AL2016W"
Option "DPMS"
HorizSync 31-84
VertRefresh 56-77

Then in Screen section I changed the line that reads

Monitor "Generic Monitor"

to read

Monitor "Acer AL2016W"

Lastly, I changed Modes line in Display subsections for bit depth 15,16 and 24 to read

Modes "1680x1050" "1024x768" "800x600" "640x480"

This gave me full 1680×1050 resolution after I rebooted, and also listed all the other resolutions supported by the monitor. I wanted to include a screenshot but I discovered that I cannot take a screenshot with PrintScreen key with the options list in that drop-down box displayed. I had to use Gimp’s delayed screenshot function (File->Acquire->Screen Shot) to obtain the picture:
Ubuntu 7.04 Screen Resolution Drop-Down Screen Shot

I am still connected with a VGA cable because DVI introduces a margin around the image.

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