[H-GEN] problem with data projector

[Peter Robinson]

Hi,
I am struggling to make my laptop talk to one of the data projectors in 
a lecture room at UQ (3-206). Xorg is defaulting to 800x600.
The display on the lecture desk pops up a window saying the optimal is 
1024x768.

I am using a Dell Latitude D600  with an ATI Radeon R250 running Ubuntu 
Edgy.

I did some google searching and found a suggestion - add the following 
to the Monitor section of xorg.conf

HorizSync  30-61
VertRefresh 56-76

When I tried that Xorg then defaulted to 640x480  :(

I then tried dpkg-reconfigure xserver-xorg with the data projector 
connected and it added

HorizSync  28-70
VertRefresh 43-60


Again that gave a resolution of 640x480  (and if I commented those out 
it was back to 800x600).

It has no trouble with other data projectors around the place (e.g. 50-2 
and 50-3 and our seminar room).

Any suggestions on what I should try next?

Peter Robinson, ITEE, UQ