There is a patch now that is expected to be in kernel version 5.13. If you're willing to build your own kernel, you can find the patch here and do it yourself:
https://github.com/thesofproject/linux/issues/2748 ** Bug watch added: github.com/thesofproject/linux/issues #2748 https://github.com/thesofproject/linux/issues/2748 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1857552 Title: [81NX, Realtek ALC285, Speaker, Internal] No sound at all To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1857552/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
