I have the same problem on a Lenovo Ideapad 5 (15IIL05), with Linux Mint 20 Xfce installed: sound works fully (incl. mic) on 5.4.0-26, but not at all on 5.4.0-40. For reference, I've had a discussion on the Mint forum: https://forums.linuxmint.com/viewtopic.php?f=49&t=323823
I have the same problem on a Lenovo Ideapad 5 (15IIL05), with Linux Mint 20 Xfce installed: sound works fully (incl. mic) on 5.4.0-26, but not at all on 5.4.0-40. For reference, I've had a discussion on the Mint forum: https:/ /forums. linuxmint. com/viewtopic. php?f=49& t=323823