We do not use a /etc/X11/xorg.conf, we remove it also.
And it works cleanly with Lambda Stack.
Which driver did you install. And the best is to send a node to ‘support@lambdal.com’
with the ‘nvidia-bug-report.log.gz’ from ‘sudo nvidia-bug-report.sh’. That will show how the messages from the xorg/xsession startup also.