I changed the Fn key on my Macbook Pro to actually work in the reverse way (so, just hitting the F1 key actually sends the "Function 1" signal, rather than the brightness decrease signal when the Fn key is not pressed, and the brightness decrease signal if the Fn key is pressed). I did this because, as a developer, it's much more useful to me to be able to utilize the function keys than the other (what I consider auxiliary) functions.

However, when I'm at home, I use an external keyboard (a Logitech K811). It's a great keyboard, but it doesn't seem to sense the preference change I made with the Fn key. That is, on my macbook keyboard, I don't have to hold Fn to activate the function keys, but on my Logitech keyboard, I do.

Is there a way to make the Logitech keyboard also act the way I have it setup in my System Preferences?

  • Did you check the settings in Logitech ? and did you try all 3 BT connections ?
    – Ruskes
    Commented Jul 27, 2015 at 23:02
  • 1
    Do you have the Logitech Preferences Manger installed ?
    – Ruskes
    Commented Jul 27, 2015 at 23:08
  • @Buscar웃SD I now have the Logitech Preferences Manager installed. If you post this as an answer, I will accept it.
    – jwir3
    Commented Jul 28, 2015 at 0:20

3 Answers 3


According to Logitech you need they Preferences Manger download and installed.

Make sure you pick the right OS X and follow the instructions.


For macOS 11 or later, you need to install the “Logi Options+” application, your keyboard will connect automatically, and you need to enable the corresponding option in the settings


In 2019 Logitech utillity to redefine Fn keys is called SetPoint. There you can redfine all FN button, even f1, f2, f3 button can obtain classic behaviour. Hope this helps.

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