High Definition Audio Driver is just working fine.

• 
  ref: RFC: snd_hda(4) -- Intel High Definition Audio driver @freebsd-multimedia
• 
  from dmesg,

  
  
  pcm0:  mem 0xee240000-0xee243fff irq 17 at device 27.0 on pci0
  
    

• 
  sysctl hw.snd.verbose=2 ; cat /dev/sndstat

  
  
  hw.snd.verbose: 1 -> 2
  
  FreeBSD Audio Driver (newpcm)
  
  Installed devices:
  
  pcm0:  at memory 0xee240000 irq 17 kld snd_hda (1p/1r/4v channels duplex default)
  
          [pcm0:play:0:dsp0.0]: spd 48000, fmt 0x10000010, flags 0x00101020, 0x00000000
  
          interrupts 59023, underruns 0, ready 0 [b:16384/8192/2|bs:131072/4096/32]
  
          {userland} -> feeder_vchan_s16(0x10000010) -> {hardware}
  
          [pcm0:record:0:dsp0.1]: spd 0, fmt 0x00000000/0x00000008, flags 0x00000000, 0x00000000
  
          interrupts 0, overruns 0, hfree 16384, sfree 0 [b:16384/8192/2|bs:0/0/0]
  
          {hardware} -> feeder_root(0x00000000) -> {userland}
  
          pcm0:play:0:dsp0.0[pcm0:virtual:0:dsp0.2]: spd 44100/48000, fmt 0x10000010, flags 0x10003030, 0x00000010, pid 944
  
          interrupts 0, underruns 0, ready 0 [b:0/4096/0|bs:65536/256/256]
  
          {userland} -> feeder_root(0x10000010) -> feeder_rate(44100 -> 48000) -> {hardware}
  
          pcm0:play:0:dsp0.0[pcm0:virtual:1:dsp0.3]: spd 0, fmt 0x00000000/0x00000008, flags 0x10000000, 0x00000000
  
          interrupts 0, underruns 0, ready 0 [b:0/0/0|bs:0/0/0]
  
          {userland} -> feeder_root(0x00000000) -> {hardware}
  
          pcm0:play:0:dsp0.0[pcm0:virtual:2:dsp0.4]: spd 0, fmt 0x00000000/0x00000008, flags 0x10000000, 0x00000000
  
          interrupts 0, underruns 0, ready 0 [b:0/0/0|bs:0/0/0]
  
          {userland} -> feeder_root(0x00000000) -> {hardware}
  
          pcm0:play:0:dsp0.0[pcm0:virtual:3:dsp0.5]: spd 0, fmt 0x00000000/0x00000008, flags 0x10000000, 0x00000000
  
          interrupts 0, underruns 0, ready 0 [b:0/0/0|bs:0/0/0]
  
          {userland} -> feeder_root(0x00000000) -> {hardware}
  
    

• 
  sysctl hw.snd

  
  
  hw.snd.report_soft_formats: 1
  
  hw.snd.targetirqrate: 32
  
  hw.snd.verbose: 2
  
  hw.snd.maxautovchans: 4
  
  hw.snd.unit: 0
  
  hw.snd.pcm0.buffersize: 16384
  
  hw.snd.pcm0.vchans: 4
  
    

• 
  /usr/sbin/mixer

  
  
  Mixer vol      is currently set to  84:84
  
  Mixer pcm      is currently set to  75:75
  
  Mixer speaker  is currently set to  75:75
  
  Mixer line     is currently set to  75:75
  
  Mixer mic      is currently set to   0:0
  
  Mixer cd       is currently set to  75:75
  
  Mixer rec      is currently set to   0:0
  
  Recording source: mic