http://bugs.freedesktop.org/show_bug.cgi?id=17255





--- Comment #3 from Alex Deucher <[EMAIL PROTECTED]>  2008-08-22 07:30:15 PST 
---
You monitor does not specify a preferred mode so the server ends up picking
one.  Also as Julien noted the driver is using the sync ranges from the monitor
section of your config which may influence that decision.  1280x960 is a valid
mode based on the sync ranges provided and it's actually 4:3 whereas 1280x1024
is not.  I suppose it comes down to what mode do you pick as a default on an
analog monitor which does not specify a preferred mode.  You can use the
preferred mode option in your monitor section to hardcode your preferred mode
if you don't like what the xserver picks.

As to the display sizes, both come from the monitor via the EDID:
- Max image size supported by the monitor:
(II) RADEON(0): Max Image Size [cm]: horiz.: 32  vert.: 24
- The extended timings can individually specify an image sizes:
(II) RADEON(0): clock: 40.5 MHz   Image Size:  310 x 230 mm
(II) RADEON(0): clock: 56.2 MHz   Image Size:  310 x 230 mm


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