[RFT] Major snd_hda rewrite - pops in rec audio

[Kim Culhan]

Having a sound problem running FreeBSD 10.0-CURRENT r230212

rec input audio has some rather loud clicks at the rate of ~ 6/second

The same hardware does not have the problem running 8.2-stable from ~2
months ago.

The clicks are not present on the analog audio output at the same time.

Also have another machine running r230212 which does not have the
problem and I have
included some debugging info from both machines.

dmesg from the problem machine:

pcm0: <Realtek ALC662 HDA CODEC PCM (Analog)> at nid 20 and 24,25,26 on hdaa0
pcm1: <Realtek ALC662 HDA CODEC PCM (Front Analog)> at nid 27 on hdaa0
pcm2: <Realtek ALC662 HDA CODEC PCM (Onboard Digital)> at nid 30 on hdaa0

the no-problem machine:

pcm0: <Realtek ALC888 HDA CODEC PCM (Rear Analog 7.1/2.0)> at nid
20,22,21,23 and 24,26 on hdaa0
pcm1: <Realtek ALC888 HDA CODEC PCM (Front Analog)> at nid 27 and 25 on hdaa0
pcm2: <Realtek ALC888 HDA CODEC PCM (Rear Digital)> at nid 30 on hdaa0

I have attached some debug files which were taken with

sysctl hw.snd.verbose=4

cat /dev/sndstat   sndstat
sysctl dev.pcm  taken with sysctl.dev.pcm
mixer
logging to messages when the sound app starts up  messages.sound_app_startup

logging to messages when the sound app starts on the machine with no
sound problem messages.sound_app_startup_works

taken from a post on the list, I tried in /boot/loader.conf:

hint.hdac.0.msi=0

There was no change.

Any help is very greatly appreciated.

thanks
-kim

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