Notebook Secondary VGA port

Mohammad BadieZadegan <[email protected]> Mon, 24 Aug 2015 16:47:08 +0330
Newsgroups gmane.os.openbsd.x11
Message-ID <CADMcpTa4pbiJq6_FiUTOiARiQWu8hWQPWVj=Bmq3TBgOSdOGbA@mail.gmail.com>
Hi everybody,
I tried dual monitor setup with this page:
https://www.maketecheasier.com/how-to-setup-dual-monitors-with-xrandr/
But still I can not active my Notebook Secondary VGA port with xrandr.
How can I enable the left side notebook VGA port?
Thanks in advance.