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An example: I have a Windows 7 desktop connected to a monitor with a native resolution of 1600x900 and support for several lower resolutions. I also connect a projector with a native resolution of 1024x768 and support for several higher resolutions (up to 1920x1200). I use the Windows + P key and select "Duplicate". This causes both the monitor and the projector to change to the same resolution, usually 1024x768, but sometimes 1600x900. Either displays a picture, but with different scaling/cropping.
I've confirmed that EDID is working because if I select "Computer only" or "Projector only" it uses the native resolution of each one automatically. I've also checked in Display Settings that the monitor is always display 1 and the projector is display 2.
How does Windows choose what resolution to use? How can I change this behavior before duplicate is selected?
Jason
Posted 2017-02-07T17:11:51.713
Reputation: 5 925
If you choose "duplicate", then they will be set to the same resolution, which will be the highest that is seen as supported on both displays. – Ƭᴇcʜιᴇ007 – 2017-02-07T17:17:44.790
@Ƭᴇcʜιᴇ007 In my example, that would be 1600x900, but it's not what happens in my experience. – Jason – 2017-02-07T17:31:46.453