According to your Xorg.0.log, you're still using your old Feisty Xorg configuration. Try running this:
sudo dpkg-reconfigure xserver-xorg
(I think you can pretty much just accept all defaults.)
According to your Xorg.0.log, you're still using your old Feisty Xorg configuration. Try running this:
sudo dpkg-reconfigure xserver-xorg
(I think you can pretty much just accept all defaults.)