When using a Keychron K1 keyboard on Ubuntu 20.10 I found that the Fn keys would not work even switching the fn for the multimedia ones, so I've found that this command can solve this issue:
I managed to get this bug fixed in Ubuntu 20.04 by following this launchpad bug thread. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1814481
Also make sure to get the latest firmware update via windows/mac
Tldr: user Eferox provided the following console command fix
echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode
from a Reddit question comment about this: https://www.reddit.com/r/Keychron/comments/gptnpt/k1_no_access_to_fkeys_in_linux_help/
As me and @bellesamways noticed, this is reset on startup so, to make this work seamlessly we need to have a way to run this on startup.
I've found that adding the script in the /atc/rc.local would do the trick in the Ubuntu 20.10 Groovy Gorilla.
So, pretty simple, as superuser you can run this to create the file if it not exists and append the script into it:
touch /etc/rc.local &&\
chmod +x /etc/rc.local &&\
echo -e "#! /bin/bash\n\
echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode\n\
exit 0" >> /etc/rc.localYou should double check if this file does not have content prior to this change, if it does, just add the line before the exit 0 and you should be good to go.
This worked well for me but you can use other ways to make this run in the system init too.