I noticed you have this in your xorg.conf? Did you put that there? Is that needed? What does it do?
SubSection "Display" Modes "1024x768" "800x600" Virtual 640 480 EndSubSection
Please take a backup copy of your xorg.conf and then run:
sudo dpkg-reconfigure -phigh xserver-xorg
and then reboot.
I noticed you have this in your xorg.conf? Did you put that there? Is that needed? What does it do?
SubSection "Display"
Modes "1024x768" "800x600"
Virtual 640 480
EndSubSection
Please take a backup copy of your xorg.conf and then run:
sudo dpkg-reconfigure -phigh xserver-xorg
and then reboot.