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I am using apple keyboard. To get the default functionality of the function keys, I need to press fn+Function key. This is quite annoying since I frequently use the function keys for debugging. Is there any way I can get the default functionality out of the function keys. i.e Get the effect of pressed Fn key without having to actually press it.

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Then check on the Mactel documentation for your model (each model seems to have slightly different). To find which model use the following command in the terminal

sudo dmidecode -s system-product-name

Documentation for the MacBookPro 5,5 13" MBP 2009 is as follows:

To swap the fn key functionality (e.g. use fn+F1 to dim the LCD etc..), edit /etc/pommed.conf and set the variable fnmode to 2

gksudo gedit /etc/pommed.conf

while for that for the MacBookPro 11,1 13" MBP (late 2013) is:

By default, the F keys serve their traditional function by pressing the "fn" key. For example, by default the "F1" key lowers display brightness and "fn+F1" is the traditional F1. I switched this behavior on all the F keys by adding a command to /etc/rc.local

sudo nano /etc/rc.local and add before "exit 0"

echo 2 > /sys/module/hid_apple/parameters/fnmode

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echo 2 > /sys/module/hid_apple/parameters/fnmode worked for me on MacBookPro 11,1. Thanks! –  Jackson Jun 21 '14 at 17:31

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