Adding borders do display (resolution problems)

[Łukasz Maśko]

My laptop (with intel-based graphics) has a matrix with a 1280x800 
resolution. Both at home and at work I also use additional monitors, which 
both do not support such resolution - they both can display 1280x1024 
pixels. If I want to achieve such situation, that I have the same screens 
on both displays, I vahe to use --scale option with xrandr and it works - 
but the picture on external screen is stretched and looks kind of weird 
(aspect is not preserved).

In the same time, when I start my system, after the i915 module is loaded 
(with KMS on), the external display is also turned on and displays exactly 
the same picture as the biult-in one. I just have a 224 pixel high margin 
on the bottom, but the aspect is correct.

Is it possible to obtain a similar situation using xrandr (a certain 
combination of parameters or something)? I just want to use just a part of 
the 1280x1024 screen to display 1280x800 desktop with the same aspect ratio 
as on the built-in matrix.
-- 
Łukasz Maśko                                           GG:   2441498    _o)
Lukasz.Masko(at)ipipan.waw.pl                                           /\\
Registered Linux User #61028                                           _\_V
Ubuntu: staroafrykańskie słowo oznaczające "Nie umiem zainstalować Debiana"