Keychron Fn Keys

Fixing Keychron function keys on Linux machines.

Tested on Keychron K2v2 on Xubuntu 20.04 and 22.04 on trenzalore.

To enable Function keys on Keychron K2:

echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode

To make this change persistent, add a module option for hid_apple:

echo "options hid_apple fnmode=0" | sudo tee -a /etc/modprobe.d/hid_apple.conf

To toggle function mode, hold Fn + X + L for 4 seconds.

If this all fails, set it back to 1:

echo 1 | sudo tee /sys/module/hid_apple/parameters/fnmode