[Bug 229190] hdac0: Command timeout on address 2 and headphone audio too low

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229190

            Bug ID: 229190
           Summary: hdac0: Command timeout on address 2 and headphone
                    audio too low
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: danilo at FreeBSD.org

Hello, I'm seeing these messages bellow in my system.

Besides these messages, the audio work pretty well. Except when I use
headphones (sysctl hw.snd.default_unit=1).
With headphones it is very low. If I increase the volume on the headphone the
audio just get terrible, like if it's not getting enough power from the jack.

$ dmesg | grep hda 
hdac0: <Intel Kabylake-LP HDA Controller> mem
0xb4320000-0xb4323fff,0xb4310000-0xb431ffff irq 16 at device 31.3 on pci0
hdacc0: <Realtek ALC255 HDA CODEC> at cad 0 on hdac0
hdaa0: <Realtek ALC255 Audio Function Group> at nid 1 on hdacc0
pcm0: <Realtek ALC255 (Internal Analog)> at nid 20 and 18 on hdaa0
pcm1: <Realtek ALC255 (Front Analog Headphones)> at nid 33 on hdaa0
hdacc1: <Intel Kabylake HDA CODEC> at cad 2 on hdac0
hdaa1: <Intel Kabylake Audio Function Group> at nid 1 on hdacc1
pcm2: <Intel Kabylake (HDMI/DP 8ch)> at nid 3 on hdaa1
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdac0: Command timeout on address 2
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdacc1: Unexpected unsolicited response with tag 63: ffffffff
hdac0: Command timeout on address 2
hdac0: Command timeout on address 2
hdac0: Command timeout on address 2
hdac0: Command timeout on address 2
hdac0: Command timeout on address 2
...

More information:

hdac0 at pci0:0:31:3:      class=0x040300 card=0x108f1025 chip=0x9d718086 rev=0x21
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP HD Audio'
    class      = multimedia
    subclass   = HDA


$ cat /dev/sndstat 
Installed devices:
pcm0: <Realtek ALC255 (Internal Analog)> (play/rec)
pcm1: <Realtek ALC255 (Front Analog Headphones)> (play) default
pcm2: <Intel Kabylake (HDMI/DP 8ch)> (play)
No devices installed from userspace.

$ mixer 
Mixer vol      is currently set to 100:100
Mixer pcm      is currently set to 100:100
Mixer igain    is currently set to 100:100
Mixer ogain    is currently set to 100:100

$ uname -a
FreeBSD capeta 12.0-CURRENT FreeBSD 12.0-CURRENT #23 r334923: Sun Jun 10
10:04:39 -03 2018     danilo at capeta:/usr/obj/usr/src/amd64.amd64/sys/CAPETA 
amd64

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