I have a redragon mechanical keyboard attached with rgb light. One time when I logged in to plasma (wayland) suddenly the keyboard light went off after some time, and when i pressed again it lit up and then again went off like after 5 sec just like auto timeout. I also checked by turning off the rgb if the keyboard functioned normally, Yes it did.
I thought it was a new feature so unplugged and replugged the USB but cannot recreate that timeout again. Was that a bug, if so having as a feature will be great.