Weird "shimmering" effect at 1920x1080 on external monitor

from AshesoftheSingularity Forums

That was a pretty bad description.  Let me try again:

 

I got a gaming laptop.  Works great on it.  However, when I plug it into an external monitor via HDMI cable, and run AotS full-screen at the monitor's resolution (1920x1080), everything... shimmers?  From the opening intro to the main menu to in-game, it flickers, or shimmers, or... something weird.  Doesn't happen at lower resolutions, or at 1920x1080 windowed.

 

Messed with all the video options (free sync, vsync, etc.) to no avail.

 

Anyone seen this and/or know what it is?  Doesn't happen with any other game, at least that I've seen.

 

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Reply #1 from AshesoftheSingularity Forums Top

Never mind, once I set Nvidia control panel to "prefer dedicated card", the issue went away.  I'd delete my original post but I can't figure out how because I am dumb.