[Bug 251727] [sound] [snd_hda] After update to r368166 no sound recording with internal microphone

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251727

--- Comment #13 from david at catwhisker.org ---
After my usual daily update on head (amd64) on my laptop (from r368756 to
r368801), I applied the patch from attachment 220693 (via "svn patch"), then
rebuilt (world -- which was superfluous -- as well as kernel).

On reboot, everything seems fine; sound still plays as it did before.  I did
not change anything in /etc/sysctl/conf or /boot/loader.conf or
/boot/device.hints.

So: works for me.  This is on the Dell Precision M4800 that is described at
https://wiki.freebsd.org/Laptops/Dell_Precision_M4800?highlight=%28\bCategoryLaptop\b%29

Reviewing a diff of the dmesg from verbose boots (before & after the change), I
see a few different addresses for kernel modules and some slightly different
timing numbers; I don't believe those are either "significant" or "issues."

In particular, the pcm0 & pcm1 lines merely appear to had other things
interspersed at different points: filtering the non-pcm lines out is not
showing any difference that I spot by eye; here it is, in case it's useful:

 pcm0: <NVIDIA (0x0041) (HDMI/DP 8ch)> at nid 5 on hdaa0
 pcm0: Playback:
 pcm0:      Stream cap: 0x00000005 AC3 PCM
 pcm0: Mixer "vol" -> "none": child=0x00000010
 pcm0: Mixer "pcm": parent="vol"
 pcm0: Soft PCM mixer ENABLED
 pcm0: Playback channel matrix is: unknown, assuming 7.1 (disconnected)
 pcm1: <NVIDIA (0x0041) (HDMI/DP 8ch)> at nid 7 on hdaa0
 pcm1: Playback:
 pcm1:      Stream cap: 0x00000005 AC3 PCM
-pcm1:         PCM cap: 0x000e07f0 16 20 24 bits, 32 44 48 88 96 176 192 KHz
-pcm1:             DAC: 9
-pcm1: 
-pcm1:     nid=7 [pin: Digital-out (Jack)]
-pcm1:       + <- nid=9 [audio output] [src: pcm]
-pcm1: 
-pcm1: Mixer "vol" -> "none": child=0x00000010
-pcm1: Mixer "pcm": parent="vol"
-pcm1: Soft PCM mixer ENABLED
+pcm1:         PCM cap: 0x000e07f0 16 20 24 bits, 32 44 48 88 96 176 192 KHz
+pcm1:             DAC:battery0: units = 0
-pcm1: Playback channel matrix is: unknown, assuming 7.1 (disconnected)
+pcm1: 
+pcm1:     nid=7 [pin: Digital-out (Jack)]
+pcm1:       + <- nid=9 [audio output] [src: pcm]
+pcm1: 
+pcm1: Mixer "vol" -> "none": child=0x00000010
+pcm1: Mixer "pcm": parent="vol"
+pcm1: Soft PCM mixer ENABLED
+pcm1: Playback channel matrix is: unknown, assuming 7.1 (disconnected)

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