Not sure if it is possible – is there a way to make macOS Sierra beta change the input language as soon as an external keyboard is connected? I have a Macbook Pro Retina 13" with an US keyboard layout, but sometimes I connect an external USB keyboard from Apple that has a German keyboard layout. While it is not difficult to manually switch between the two input languages, is there a way to automate this?
Change input language in macOS Sierra beta when an external keyboard is connected/disconnected
automationkeyboardlanguage
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It appears that OS X requires a keyboard layout that it recognizes as producing latin characters to be selected as one of the choices in the menu, and it does not recognize ArgenPinYin as one of them. I can deselect the US layout if I select German or Portuguese, for instance, but not if I select Greek or Pinyin - Simplified.
So yes, U.S. can be removed as a language, but some other keyboard layout that OS X recognizes as a Latin layout must first be selected.
In Preferences, go to Keyboard, select the second tab and then "Keyboard and Text Input" (or similar). The key combinations to switch Input Sources should be shown on the right (and may need to be re-assigned because the default assignment conflicts with Spotlight).
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Best Answer
Karabiner can be set up to activate a different keyboard layout only for an external keyboard. See
Different key-maps/bindings for in-built keyboard and Bluetooth keyboard