I do have the same issue with auto login and Sony KDE 46 inch TV. Changing monitor sorts out the issue or just move to headless mode with appending /etc/X11/xorg.conf
Section “Screen”
Identifier “Default Screen”
Monitor “Configured Monitor”
Device “Tegra0”
SubSection “Display”
Depth 24
Virtual 1280 800 # Modify the resolution by editing these values
EndSubSection
EndSection