I've reported an issue with snd-hda-intel with my Gigabyte GA-Z87X-UD3H motherboard on Launchpad but it seems not the best place to that

See :https://bugs.launchpad.net/bugs/1248116

In "Volume control PulseAudio", I can see pulseaudio changing the audio output "Internal Audio Analogic Stereo". The port switch rapidly from "Analogic output" to "Analogic headphones" making a jerky sound.

You can find the trace.log file here :

https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+ bug/1248116/+attachment/3934401/+files/trace.log

It seems that there are many hda_power_count

1/ This problem appears with the front connector on the motherboard connected to a HDA front panel on the case (I've double-checked the connection) 2/ The problem still appears when the front connector on the motherboard is not connected at all to the case ! 3/ This bug seems quite common with Gigabyte motherboard : If you search with Google "Gigabyte Z87X hda" you will find other descriptions of this same strange behavior :

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1242302 https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1067434

If I disable jack detection by specifying a hint for early patching (jack_detect = no), the sound is cristal clear !

https://launchpadlibrarian.net/160462582/trace.log

it is strange that hda_power_count = 2 only occur when pulseaudio

alsa-sink-ALC89-2776 [005] .... 334.305170: hda_power_count: [0:2] power_count=1, power_on=1, power_transition=0 alsa-sink-ALC89-2776 [005] .... 334.305171: hda_power_count: [0:2] power_count=0, power_on=1, power_transition=0 alsa-sink-ALC89-2776 [005] .... 334.305185: hda_power_count: [0:2] power_count=1, power_on=1, power_transition=0 alsa-sink-ALC89-2776 [005] .... 334.305186: hda_power_count: [0:2] power_count=2, power_on=1, power_transition=0

seem bug in snd_hda_power_up() and snd_hda_power_down()