I use my MacOS (with Ventura) with 2 different external keyboards. On the first, all runs smoothly. On the second, a Logitech K120 with an ISO-IT layout, the right option key doesn't work at all.

Here is my modifier mapping:

enter image description here

I wouldn't like to use external software to remap keys. As I mentioned, my first keyboard is working fine and I do not want to break its functionalities.

How can I fix?

1 Answer 1


Most Windows keyboards don't have a 'right Option' Key. Instead they send AltGr, which is interpreted as Ctrl + Alt pressed simultaneously.

The Mac cannot then differentiate it from truly pressing Ctrl ⌃ + Opt ⌥ .

It may be possible to remap this in Karabiner-Elements, though I'm not familiar with its operation.

  • I see. Will this affect also the behavior of the other external keyboard? Commented Jan 3, 2023 at 14:16
  • 1
    idk whether Karabiner can target a specific keyboard, but if the other is an Apple or equivalent, it won't be sending AltGr in the first place, so there's nothing to remap.
    – Tetsujin
    Commented Jan 3, 2023 at 14:23
  • btw, even if I swap back CMD and Option in the mapping, the AltGr key works properly as an Option Key, the right-CMD doesn't work at all again. Commented Jan 3, 2023 at 14:27
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    Windows keyboards don't have a Cmd key, though the Windows key [on the left] is usually translated as one. I've never seen one on the right. There's sometimes a Menu key, but idk how that's interpreted, if at all.
    – Tetsujin
    Commented Jan 3, 2023 at 14:36

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