Posted on Nov 20, 2007

Hooking up a second ACER monitor as an extended desktop

I am adding a second ACER monitor to my Macintosh setup. I am having trouble getting an extended desktop. Currently I can only get a mirrored desktop (same image on both screens.

1 Answer

Anonymous

I have 2 acer AL2016W's and have the same problem. The earlier ones with the VGA only are the problem from what I can see, they just don't play nicely with the video card for some reason.
First, on your main monitor, click "Show displays in menu bar" on your monitor control panel. This will let you set the resolution for each monitor from the main one, click on the little monitor icon on the top right screen to do this.
If that doesn't work try this:
Connect one acer as the main monitor and one crappy vga crt monitor as the second.
Set mirrored desktop in the system preferences so that the crappy CRT is displaying the exact same resolution as the acer. (1680x1050 59.9Hz)
Disable mirrored desktop. You should now have an acer and a crappy CRT both running 1680x1050 in extended desktop mode.
Shut down, reconnect the acer in place of the crappy CRT.
This should "trick" your video card into having the right resolution, otherwise you'll just get the stupid "input not supported" screen, with no ability to auto configure or use any of the built in controls.

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