Created attachment 621750 [details]
alsa info at boot, with headphones, and after unplugging headphones

Sound works fine upon boot. With no headphones plugged in, sound plays from
built-in speakers. 

After plugging in headphones, sound also plays fine. As expected sound plays
from headphones and not from built-in speakers. 

After unplugging headphones, sound will not play from built-in speakers, even
with maxiumum volume. 

If the headphones are plugged back in, sound will play from headphones again.