Comment 8 for bug 1939986

Can also confirm this bug, I'm on Ubuntu Mate 20.04.3.

Manually replaced missing /lib/firmware/i915 files with binaries from

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915

Then ran update-initramfs -u w/o any errors.

Installing the the missing i915 files also made my sound card produce music like it should.

The bottom line is if you are missing firmware files, don't expect you computer work the way the manufacture expected.