> That specific kernel module does not require any firmware. Well, I am using:
$ uname -a Linux Microknoppix 5.3.5-64 #16 SMP PREEMPT Wed Oct 23 02:08:38 CEST 2019 x86_64 GNU/Linux which they say is based on buster. I will have to test the thing with Debian and/or ask directly the knoppix folks.
