I mentioned last week that there was a fix in the nemomobile call-volume
code which fixed the parsing of the GET_MUTE response, and that I was
hopeful that this would fix the problem.   It doesn't...

I've run RIL traces on both phones, and I see the exact same sequence of
requests sent.

On startup, the mute state is probed, and on both, it's enabled.  When
an outgoing call is made, REQUEST_SET_MUTE (0) is sent to RIL on both
phones to disable mute at the start of a call.   When the mute button is
pressed, I see REQUEST_SET_MUTE (1) sent for both, with a normal
response returned.

So for some reason, the Nexus4 RILD is ignoring the mute request.

The next step to debug is to flash vanilla Cyanogenmod and enable RILC
tracing.

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https://bugs.launchpad.net/bugs/1190673

Title:
  Mic mute does not work on Nexus4

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