I intend to connect my old full HD TV as external display to a mid-2012 MacBook air.

While being "only" 1920×1080, the TV has 42", so each element would look ridiculously large. So I thought about "emulating" it to be, say, 4k, then downscale the signal to the 1080 the TV can handle.

Is there such a possibility?

  • MacBookAir5,1
  • Mojave 10.14.6
  • Intel HD Graphics 4000 1536 MB

1 Answer 1


Assuming you want to extend your desktop and not just mirror it: The Mac does this by default, for more fine grained options go to System Preferences → Screen, a window for the TV will appear, where scaling options is avaliable. For even more options hold down the Alt/Option key while clicking on "Scaled"

  • Hello @Harker, thanks for the tipp with pressing "alt". True, I can set the resolution below the screens capability, but my aim is to set it ABOVE (as far as apps are concerned) and downsample right before sending to HDMI. Sep 30, 2019 at 17:41

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