Following up to my previous post, there is a much simpler way to tell
the kernel where to look for the extra firmware without messing with
grub.
/lib/firmware/updates
is mounted rw and can be used to place the missing firmware. So the
updated steps would be,
apt download firmware-sof-signed
dpkg-deb -x firmware-sof-signed_*.deb /tmp/extracted
sudo mv /tmp/extracted/lib/firmware/intel /lib/firmware/updates
Reboot, and audio should be fully functional.
Might be worth ensuring correct permissions,
sudo find /lib/firmware/updates -type f -exec chmod 0644 {} \;
sudo find /lib/firmware/updates -type d -exec chmod 0755 {} \;
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https://bugs.launchpad.net/bugs/2092363
Title:
Missing (but referenced) SOF firmware in pc-kernel – No Audio
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