Why is image stretched vertically on widescreen monitor?

[Val]

Hi. I am not sure if this is the right place to post basic user questions, so if not, please direct me to a more suitable list.

I just tried to set up 2 monitors on my dual monitor NVIDIA card and I am confused with the result. 
The monitors are:
1) 22' 16:10 LCD
2) 19' 4:3 CRT

I am running the LCD at its native res of 1680x1050 and the CRT is at
1280x1024. This almost works, save for a subtle issue - the aspect ratio
on the LCD appears to be incorrect. An image of a perfect circle looks
like a circle on the CRT, but when dragged to the LCD, I can tell that
the circle is vertically stretched into an ellipse (y > x). 

I manually set the DPI to be 100x100. Here is the relevant line from the
log:
(**) NVIDIA(0): DPI set to (100, 100); computed from "DPI" X config option

but it had no effect.

Here is the device section of my xorg.conf:
Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    Option   "UseEdidDpi"   "FALSE"    
    Option   "DPI"   "100x100"

    Option "TwinView"
    Option "ConnectedMonitor"           "DFP-0, CRT-1"
    Option "HorizSync"          "DFP-0: 30-110; CRT-1: 31-82"
    Option "VertRefresh"        "DFP-0: 50-150; CRT-1: 55-120"
    Option "MetaModes"          "DFP-0: 1680x1050, CRT-1: 1280x1024;
    Option "TwinViewOrientation"        "CRT-1 RightOf DFP-0"
EndSection

Can anyone please explain to me why the circle looks stretched on the
LCD and if it is possible to do anything about it? 

Thank you.

-- 
Val <vace117 at yahoo.ca>

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com