--- Comment #19 from John Shand email@example.com --- (In reply to Takashi Iwai from comment #18)
(In reply to John Shand from comment #17)
i can't believe the kernel guys let that one out of the bag.
You're expecting them having always a magic crystal...
Please double-check that kernel-default-5.10.4 breaks and kernel-vanilla-5.10.4 works. If this is confirmed in 100%, it's a good hint for tracking further.
I was mistaken with the kernel 5.10.4 vanilla it doesn't work. arch linux kernel 5.10.4 does work