Comment 15 for bug 1877757

I don't think the fix has been back-ported to 5.4 kernel.

The upstream kernel fix was included in kernel 5.8-rc1 and later: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/sound?h=v5.8-rc4&id=89d73ccab20a684d8446cea4d8ac6a2608c8d390

I tested with the 5.8-rc1 mainline kernel on Ubuntu 20.04: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc1. Sound output works without any boot parameter but the microphone array did not work for me on SF314-57-74V6.

With security boot enabled on the laptop, manual signing the mainline kernel is very cumbersome and difficult when doing software updates. I lost appetite and will probably wait for Ubuntu 20.10 which might pick up a later release of the kernel that has the fix.