hello.  What video driver/kernel driver are you using to drive the 
display?  I had a
similar problem using the intelfb(4) driver.  I had to revert to the genfb(4) 
driver to get the
VGA port to work properly.  The Displayport /HDMI ports worked fine under the 
intelfb(4)
driver, but the VGA port would switch off as soon as the BIOS lost control of 
the card.
-thanks
-Brian


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