Testing 5.4.86-20210102-debug here, worked fine, though loud, using PMUniMix (has 5 controls, which seems about right) to turn down the volume results in the system sounds that often start loud then adjust to the correct volume while playing.
Command line mixer for UNIAUD32. Version 1.1
Detected UNIAUD version 2.02.05
Detected 1 audio adapter(s)
Card info for adapter 0:
num: 0
id: PCH
driver: HDA-Intel
name: HDA Intel PCH
longname: HDA Intel PCH at 0xe1b60000 irq 22
mixer: Realtek ALC269VB
componenets: HDA:10ec0269,102804ad,00100100 HDA:80862805,80860101,00100000