Acer Aspire

I have a slightly older Acer Aspire laptop which has both HDMI and VGA outputs on the side. I assumed that those two outputs would mirror each other, or only one could be active at a time, so imagine my surprise when I plugged a monitor into each and had a triple-monitor setup on it under Linux. I am going to get a VGA-HDMI converter so that I can use both of my 32" monitors (which do not have VGA inputs) for work, and dedicate my more powerful Acer Predator laptop as a strictly gamming machine.