It seem like you haven't reinstalled xserver-xorg-video-ati:
[    20.442] (II) LoadModule: "ati"
[    20.458] (WW) Warning, couldn't open module ati
[    20.458] (II) UnloadModule: "ati"
[    20.458] (EE) Failed to load module "ati" (module does not exist, 0)
So you are running the FBDEV driver.

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[KMS] White Screen instead of desktop after 10.10 update (ATI Mobility Radeon 
7500 card)
https://bugs.launchpad.net/bugs/655099
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