Was thinking of using a joycon as a presenter's clicker. A quick test on my Android phone shows it paired just fine via Bluetooth, though the input is a bit slow and laggy.
However, in 16.10 the Device Search doesn't seem to discover the joycon in sync mode. I've paired bluetooth headphones to this computer successfully, so I don't think it's the hardware. Are there settings or libraries I need to tweak to fix this?
On PopOS 21.10 (Ubuntu derivative), I got this working by following the advice in this answer::
sudo apt install xserver-xorg-input-joystick
and then rebooting. Both JoyCon joysticks work for controlling the mouse (and moving them together makes it move faster). The right JoyCon can use B for left click and X for right click.
Just tried a laptop I have at home, and it worked. Keybuttons aren't recognized, but that might be a bluetooth joystick button mapping thing on a per app basis I need to investigate more.
Not sure why it didn't work on the desktop though!
