1) I disconnected my speakers from the rear jack, and plugged my
headphones into the front jack. After rebooting, the headphones are
detected and the sound works - everything is perfect. I opened the Sound
Settings dialog, and "Headphones" are present, "Line Out" is absent.

2) I plugged my speakers into the rear jack, and sound immediately
stopped playing from the headphones. But the speakers are also silent,
even though they're not muted in the GUI. I try muting and unmuting,
switching between headphones and line out in the GUI, but nothing works
- neither the speakers, nor the headphones.


these are pulseaudio bug since you don't have the above patch,  

line out jacks are muted by the driver
headphone are muted by pulseaudio

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https://bugs.launchpad.net/bugs/1442428

Title:
  Headphones not detected after fresh boot or suspend/resume cycle,
  until unplugged and plugged back in

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