Sorry for the delay, but I was finally able to test 4.9rc3.  The system
does identify two audio devices: broadwell-rtXYZ headphones and
broadwell-rtXYZ speakers (sorry, I don't remember the number).
Unfortunately audio playback still doesn't work (using the sound
settings panel "test settings" tool appears to be working but no sound
comes out of speakers or headphones).  Both alsamixer and the Sound
control panel show the devices, and I tried to adjust volume to make
sure something wasn't muted, but I can't rule out user error at this
point.

It's probably worth noting that I lose my wifi when I boot 4.9 (and the
reason I didn't grab the exact name of the devices).

Is there any else I can do to help?

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https://bugs.launchpad.net/bugs/1441852

Title:
  [HP Spectre x360 - 13-4010ca] Audio broken, broadwell-U audio
  controller

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