Keychron K1v3 (firmware V3.7) on Ubuntu 19.10 (upgrad path from 18.04),
can confirm that
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1814481/comments/19
fixes the issue when connected via Bluetooth.


Some additional information: For me when connected via Bluetooth only the 
function keys would work. The following command as described by Eferox, allowed 
me to use the keyboard normally:

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

Note that this means that the `fn` key is now disabled by default, so
pressing one of the `F<num>` keys registers as `F1`, `F2`, etc. In order
to get the media key functions you have to press `fn` + `F<num>`. Also
note that if you also use an Apple keyboard this probably modifies its
default behaviour.

Explanation of parameters for `/sys/module/hid_apple/parameters/fnmode`
https://superuser.com/questions/79822/how-to-swap-the-fn-use-of-function-keys-on-an-apple-keyboard-in-linux

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https://bugs.launchpad.net/bugs/1814481

Title:
  Keychron K1 keyboard not working

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