Let's take a step back and look at what we have and what works under
which situation. So these are the 2 outputs and 3 mic inputs on the Sony
Vaio Z11/Z12/Z13:

 * Internal speakers (stereo)
 * Internal microphone (mono)
 * One combined 5-segment jack for headphones (stereo) and external microphone 
(mono or stereo?) for the Sony earplugs with built-in microphones on each ear 
that came with the laptop
 * One external microphone jack (assuming mono)

 A. In the default out-of-the-box situation, my internal speakers remain
silent. Earplugs do work, but mics in the earplugs do not work. Internal
mic does work and when I plug a microphone in the external mic jack, the
internal mic is silenced and the external one takes over.

 B. When I only check the "Override" for 0x15 (headphones), it fixes my
internal speakers and sound flows through my earplugs as soon as I plug
them in (and internal speakers are silenced). Earplug mics don't work.
Internal mic does work and when I plug a microphone in the external mic
jack, the internal mic is silenced and the external one takes over.

 C. When I only disable 0x18 (black mic, right side) by setting
"Override" to "Not Connected", it does fix my internal speakers and
headphones still work as expected. But now I don't have any internal
microphone anymore. However, as soon as I plug in my earplugs with
built-in microphones, I do see a microphone input. Tapping left and
right earplug confirms that they work. I think the two mics (left ear
and right ear) deliver one input stream (mono), as I count 5 segments on
the jack plug - 3 for stereo out and 2 for mono in, correct? Or do you
think the two mics in the earplugs are stereo? The external mic jack
does not work in this situation.

 D. When I only disable 0x19 (also black mic, right side), my internal
speakers and headphones also work as expected. But again, no internal
microphone. And the earplug mic also does not work in this situation.
Only the external mic jack works.

 E. With 0x12 disabled I have no working speakers nor internal mic.
Earplugs do work, but its mics don't work. External one does.

Based on the above findings, I would conclude that:

 * 0x12 is the internal mic
 * 0x14 is the internal speakers
 * 0x15 is headphones output
 * 0x18 is the external mic jack
 * 0x19 is headphones mic input

Situation B works the best for now, but what we ultimately want (out-of-
the-box) is:

 1. Without anything plugged in: working internal speakers and internal 
microphone.
 2. With earplugs-with-mics plugged in (0x15 and 0x19): speakers silenced and 
earplugs take over. Sound options should show 2 mic inputs (internal and 
external) and user should be allowed to choose one of the two inputs.
 3. With external mic plugged in (0x18): internal microphone silenced and 
external one takes over. This action is more explicit - you intend to use the 
external microphone.
 4. With both earplugs-with-mics and external mic plugged in (0x15, 0x19 and 
0x18): speakers and internal mic silenced. Output flows through earplugs. 
External mic (0x18) is the only input (intentional use of external mic jack).

Do you think this is achievable?

Any pointers in the right direction?

Thanks so much for your time!

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https://bugs.launchpad.net/bugs/960124

Title:
  [VPCZ13C5E, Realtek ALC889, Speaker, Internal] No sound at all

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