I have a similar problem. I'm rowking on my laptop Acer-8935G with speakers in 5.1 system. Before update from v. 1909 to v. 2004 of windows 10, my laptop work in 100% with my all my built speakers (5.1) and dedicated drivers 2.82 (6.0.1.8186) by Realtek. After update my subwoofer not working. I was reinstal dedicated drivers 2.82 (6.0.1.8186) but this solution not working. In setting option i was change sub to center but only my subwoofer not working anymore.
I remember that this failrure was exist on unknown by me and previous build of windows 10.
Now i don't know that is the problem. Please fix it.