Comment 26 for bug 2009136

@koba I've tried each of the kernels in comment 25 and I'm afraid it rather refutes the theory that fdcc4c22b is the culprit:

The latest vanilla kernel (#1) is "good"; HDMI audio works happily. That suggests (although not conclusively) that fdcc4c22b isn't the culprit as it presumably includes that commit.

The latest vanilla kernel with fdcc4c22b reverted (#2) is also "good"; HDMI audio works, although I did note dmesg had an awful lot of preempt errors reported in it (which did not appear with the vanilla kernel above).

Finally, just to put the nail in the coffin of fdcc4c22b being the faulty commit, the 5.19.0-35 kernel with fdcc4c22b reverted (#3) is "bad"; exhibits the original failure with HDMI audio being unavailable.