Re 1. vesa can not use dri or glx extensions
Re 2/3. the Xorg server loads fglrx if specified in xorg.conf. If not, it 
checks all its drivers for support for your card. Only vesa takes up the 
challenge. ati does not recognize the card. If you have radeonhd installed, I 
think it will be picked (before vesa).
Re 4. the Xorg server first checks for valid modes with a strict filter. Since 
nothing passes through, it checks again with a less strict filter.

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