I got a Varmilo VA109M keyboard recently (it’s great!), which I’m using on Ubuntu 20.10.
This is how I got the F-keys working correctly:
echo options hid_apple fnmode=2 | sudo tee -a /etc/modprobe.d/hid_apple.conf sudo update-initramfs -u -k all
And to get the Super key (labelled
Win on Varmilo PC keyboards) working
correctly, make sure your Varmilo keyboard is in PC mode:
Fn + Esc for 4 seconds.
CapsLock key light will flash when the mode has been changed successfully.
One final tip: to control the backlights, use
Fn + ↑ (up arrow key).