Computers are a dumb assembly of components: they don't do what you want them to do, they do what they are told to do.
With the autoconfigure, you should not have a xorg.conf file in a first stage.
It should display in the maximum depth and resolution available.
Run startx
unlog from X
and read the /var/log/Xorg.0.log for hints
Now, if you are under a VM, check that's VM users forums.
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