Did 14.2 break audio on all Intel HD

When I upgrade a Celeron CPU J3455 media box (Apollo/Broxton) from 13 to 14.2, the video-driver lost audio from its HDMI. It still appears as a device "pcm2: <Intel Broxton (HDMI/DP 8ch)>", but there's no audio from it.
I was able to use the Realtek output for a few weeks but that seems to have died, so any info on what might be going on with 14.2's audio would be appreciated.
 
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