Okay, so my "solution" to this problem was to just enable short-term distribution support in the Software Updater, and to update to Ubuntu 20.10, the kernel is now ' 5.8.0-29-generic x86_64 ' and it actually recognizes the whole 5.1 audio system instead of just stereo audio.
Although this might not be the ideal solution for everyone, at least it solved _this_ issue. I'm kinda worried, though, that the underlying cause for this (as reported by so many) will remain unsolved.
Okay, so my "solution" to this problem was to just enable short-term distribution support in the Software Updater, and to update to Ubuntu 20.10, the kernel is now ' 5.8.0-29-generic x86_64 ' and it actually recognizes the whole 5.1 audio system instead of just stereo audio.
Although this might not be the ideal solution for everyone, at least it solved _this_ issue. I'm kinda worried, though, that the underlying cause for this (as reported by so many) will remain unsolved.
Oh well, the only way is forward.