Resolution 700x525 on RV350

[Torquil Macdonald Sørensen]

Hello, I have a laptop with a 1400x1050 screen, and would like to be able to 
use it at half of the resolution, i.e. 700x525, because that would look 
better than e.g. 640x480 and 800x600, since it is eactly half of the physical 
resolution of the screen. It is an IBM T42 with an ATI Radeon Mobility 9600 
card. I have added 700x525 to the Modes-line in the Display subsection of the 
Screen section in xorg.conf:

***********************
Section "Screen"
.
SubSection "Display"
.
Modes "1400x1050" "1280x1024" "1280x960" "1024x768" "800x600" "700x525" "640x480"
**************************

In /var/log/Xorg.0.log it says:

*******************************************************
(II) RADEON(0): Added native panel mode: 1400x1050
(II) RADEON(0): Adding Screen mode: 1280x1024
(II) RADEON(0): Adding Screen mode: 1280x960
(II) RADEON(0): Adding Screen mode: 1024x768
(II) RADEON(0): Adding Screen mode: 800x600
(II) RADEON(0): Adding Screen mode: 700x525
(II) RADEON(0): Adding Screen mode: 640x480
(II) RADEON(0): Total number of valid Screen mode(s) added: 6
*****************************************************************

The output from xrandr is:

**************************************************************************
Screen 0: minimum 320 x 200, current 1400 x 1050, maximum 1400 x 1200
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1400x1050+0+0 (normal left inverted right x axis y axis) 0mm x 
0mm
   1400x1050      60.2*+
   1280x1024      59.9
   1280x960       59.9
   1280x800       60.0
   1280x768       60.0
   1024x768       60.0     59.9
   800x600        60.3     59.9
   700x525        59.8
   640x480        59.9     59.4
S-video disconnected (normal left inverted right x axis y axis)
******************************************************************

However, "xrandr -s 700x525" results in:

*************
Size 700x525 not found in available modes
*************

How come xrandr is saying that it is not an "available mode", when it is on 
the list? Is it impossible to get a 700x525 resolution?

Best regards
Torquil Sørensen