Comparing the two Xorg.0.log files there are several things that catch
my attention:

1. (WW) "dbe", "dri", "glx", "vbe" will not be loaded unless you've specified 
it to be loaded elsewhere. ?
In the ATI log these modules are loaded successfully

2. After the RECORD extension ATI loads fglrx and the Ubuntu loads vesa
Why? The xorg.conf states fglrx to load

3. After thy synaptics drivers, ATI loads Video4Linux drivers and starts
the proprietory ATI driver, Ubuntu launches the vesa driver

4. Somewhere later the vesa driver decides first not to use 1400x1050
then it chooses to do so. This is a vesa built-in mode.

Does this make sense for you?

-- 
[M76] Gnome desktop resolution incorrect
https://bugs.launchpad.net/bugs/152179
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