4:3 resolutions on a widescreen notebook display

[Gérard Milmeister]

Hi,
I just bought a notebook with an ATI X1600 card and a 1680x1050 display.
This works fine with the fglrx driver (except AIGLX). I can also easily
switch resolutions with xrandr. However 4:3 resolutions such as 1024x768
are always stretched to fill the screen which is a little annoying since
such resolutions are required to drive external displays such as
projectors.
Is there a way to keep the pixels square and not stretch?

-- 
Gérard Milmeister
Langackerstrasse 49
CH-8057 Zürich