Created attachment 770312 [details]
Patch that fixes the problem on kernel-4.4.126_48_default (openSUSE 42.3)

OS/kernel is unable to operate Lenovo wireless keyboards based on Primax
Electronics chips. The reason is likely that HID information communicated by
the chip is misinterpreted by the kernel (hid-core module).

The issue is extensively discussed at:
https://forums.lenovo.com/t5/Linux-Discussion/Professional-Wireless-Keyboard-not-working-on-Linux/td-p/3726486
https://askubuntu.com/questions/897729/lenovo-professional-wireless-keyboard-and-mouse-combo-not-working-in-ubuntu
and diagnosed/patched at:
https://unix.stackexchange.com/a/377873/239474

Reproducible: Always

Steps to Reproduce:
1. Install openSUSE 42.3
2. Plug in Lenovo Wireless Professional keyboard (e.g. https://lnv.gy/2ImwNuh ,
with optional Mouse)

Actual Results:  
Typing does not have any effect except for Win and volume control buttons.
Optional mouse works, that is, the USB dongle/receiver work, however the
regular keys are not processed by the system/kernel. A VM running, e.g.,
Windows on the same machine works with this keyboard as expected. 

Expected Results:  
User was told what this hardware works with any AT-compatible PC with USB. In
linux, the hardware does not function properly.

Solutions found:
There is a patch available at 
https://unix.stackexchange.com/a/377873/239474
which fixes the issue on openSUSE 42.3 (tested on kernels 4.4.126-48-default
and 4.4.120-45-default, openSUSE 42.3). Patching every kernel update works, but
as such is a great nuisance. Applying this patch upstream would be nice.