I’m running ubuntu 21.10, kernel 5.13.0-22, and also having the headphone mic problem, as reported by @Jay_Sekora above in comment 105.
I tried installing kernel 5.15.6 as suggested by @EdgeCase to resolve the sticky mouse issue, and to see if that fixed the mic problem, but when I reboot I get the message “can’t find command ‘hwmatch’ file linux-(can’t remember which one).deb has invalid signature.”
When I check the checksum file using
gpg --verify CHECKSUMS.gpg CHECKSUMS
I get
gpg: Signature made Mon 18 Oct 20210o 01:32:12 AM MDT
gpg: using RSA key E50C6A0917C622B0
gpg: BAD signature from “Kernel PPA kernel-ppa@canonical.com” [unknown]
The files do seem to validate ok using:
shasum -c CHECKSUMS 2>&1 | grep 'OK$'
but obviously that’s suspect given the problem with the CHECKSUM files themselves.
Hints on where I screwed up?
Edit: I’ve attempted to restore hwmatch.mod using
cp -p /usr/lib/grub/i386-pc/hwmatch.mod /boot/grub/x86_64-efi but that didn’t change anything. How do I get a normal/default boot environment back?
Using apt purge on the 5.15.6 files and rebooting restored the normal boot process. It would be nice to know what was actually wrong with the boot configuration.
The CHECKSUMS issue was because I originally used the CHECKSUMS file from the main download directrory, not the architecture-specific subdirectory.