Comment 1 for bug 1248116

https://wiki.ubuntu.com/PulseAudio/Log

https://wiki.ubuntu.com/Audio/AlsaInfo

http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa/HD-Audio.txt

Tracepoints
~~~~~~~~~~~
The hd-audio driver gives a few basic tracepoints.
`hda:hda_send_cmd` traces each CORB write while `hda:hda_get_response`
traces the response from RIRB (only when read from the codec driver).
`hda:hda_bus_reset` traces the bus-reset due to fatal error, etc,
`hda:hda_unsol_event` traces the unsolicited events, and
`hda:hda_power_down` and `hda:hda_power_up` trace the power down/up
via power-saving behavior.

Enabling all tracepoints can be done like
------------------------------------------------------------------------
  # echo 1 > /sys/kernel/debug/tracing/events/hda/enable
------------------------------------------------------------------------
t

hda:hda_unsol_event` traces the unsolicited events

try

disable automute by amixer

disable headphone Jack detection by hints or hda-jack-retask