Yes, I am pretty sure we are having the same problem. I found the cause of the problem, and a workaround solution:
It seems the subsystem that reports whether the laptop is in tablet mode or not always reports that it is in tablet mode. As a consequence, libinput will disable input events from the keyboard. I don’t know whether this is a driver issue or a hardware issue with our specific laptops, since I can’t find many references to the problem.
Either way, it is possible to fix it by enabling a “quirks” option in libinput. First create the directory “/etc/libinput”, and then create a file in that directory named “local-overrides.quirks”:
sudo mkdir /etc/libinput
sudo touch /etc/libinput/local-overrides.quirks
Now edit the file and paste the following:
[Tablet Mode Switch]
MatchName=*Intel Virtual Button*
ModelTabletModeSwitchUnreliable=1
Reboot the computer, or just restart Xorg, and keyboard input is working 
Hope it helps.
If someone from Chuwi could chime in, it would be nice. Obviously this is a bit of a workaround, and the tablet mode switch should be working better. Some additional info: While monitoring the tablet mode switch hardware with the evemu-record program, there is never any events happening from the tablet mode switch, so maybe it is indeed stuck in hardware for some reason, or simply not working.