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1b1ed1a
(Get the code!)
Update with some new info. I booted into Win10 and noticed that it wasn't recognizing an audio device. Googled around a bit and ended up (re)installing the Realtek drivers largely by following what I read here:
http://
NOTE: I did the diagnostic and the 8 tones played correctly from the speakers.
Rebooted into Win10 again. It was showing an audio device, but I couldn't get it to actually play anything.
Rebooted into Ubuntu again, and it now sees the broadwell-rt286 device! With a little poking in sound preferences, I'm able to get the laptop speakers to work. Not quite out of the woods yet though.
1) If I reboot the computer into Ubuntu, the broadwell device disappears. I have to go into Win10 and then back into Ubuntu to get it to show up again.
2) If I plug speakers into the headphone jack, I can get sound to work, but if the sound card is left alone for any length of time is starts making a loud persistent clicking sound over and over. The speakers will play any audio just fine, but if I'm not doing anything, there's a continuous clicking noise.
I'm attaching the output of a new run of also-info.sh, which definitely has a bunch of new things in it compared to the attachment in my previous comment.