xorg.conf how to set to mirror mode

[Jason Wu]

Hi it works!

actually i have 2 outputs
1. USB to VGA dongle displaylink
2. On board Intel VGA

but it only works when i set my "Main Screen" as USB to vga dongle,
and the other on board display card screen, as "2nd screen".

but my goal is to set the "Main Screen", to the intel one,
and sub screen as usb to vga dongle.
and i have tried to set xorg as followed

Screen         0 "Screen1" 0 0
Screen         1 "DisplayLinkScreen" 0 0
Option         "Xinerama" "true"

but it only show Screen 1 now, which is intel on board displaycard screen,
but the mirrored screen is not up , DisplayLinkScreen
can you give me any suggestion to modify or test?

Thanks!
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