The Keychron K2 and K3 have dual-purpose media/function keys. The accompanying card says to use fn+x+l to change modes, but I tried it and it didn’t work. I need my function keys, I’m already used to pressing
fn when I do need to access multimedia functionality.
I found this repo which explains how to set up a systemd service to configure the keys by writing a value to a driver configuration file. This works, but I was also able to get this changed immediately (though not persistently) by doing:
# Set the keys to operate in Fx mode echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode # Set the keys to operate in multimedia mode echo 1 | sudo tee /sys/module/hid_apple/parameters/fnmode