Solved Changing sound devices in real-time

A

Atsuri

Using existing FreeBSD facilities, is it possible to issue a command to force a change of the current sound output device? If so, how?

My problem pertains to switching sound output from an in-built desktop sound speaker to headphones plugged in through the front jack socket.

Here are the possibly relevant outputs:
Code: 
device    snd_hda
dev.pcm.4.%parent: hdaa1
dev.pcm.3.%parent: hdaa1
dev.pcm.2.%parent: hdaa1
dev.pcm.1.%parent: hdaa0
dev.pcm.0.%parent: hdaa0
dev.hdaa.1.reconfig: 0
dev.hdaa.1.gpo_config:
dev.hdaa.1.gpo_state:
dev.hdaa.1.gpio_config: 0=keep 1=keep
dev.hdaa.1.gpio_state: 0=disabled 1=disabled
dev.hdaa.1.gpi_state:
dev.hdaa.1.config: forcestereo,ivref50,ivref80,ivref100,ivref,vref
dev.hdaa.1.nid38: vendor widget [DISABLED]
dev.hdaa.1.nid37: vendor widget [DISABLED]
dev.hdaa.1.nid36: vendor widget [DISABLED]
dev.hdaa.1.nid35: audio mixer
dev.hdaa.1.nid34: audio mixer
dev.hdaa.1.nid33: vendor widget [DISABLED]
dev.hdaa.1.nid32: vendor widget [DISABLED]
dev.hdaa.1.nid31: vendor widget [DISABLED]
dev.hdaa.1.nid30_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid30_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid30: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid29_original: 0x40028201 as=0 seq=1 device=Line-out conn=None ctype=1/4 loc=0x00 color=Purple misc=2
dev.hdaa.1.nid29_config: 0x40028201 as=0 seq=1 device=Line-out conn=None ctype=1/4 loc=0x00 color=Purple misc=2
dev.hdaa.1.nid29: beep widget
dev.hdaa.1.nid28_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid28_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid28: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid27_original: 0x02211030 as=3 seq=0 device=Headphones conn=Jack ctype=1/8 loc=Front color=Black misc=0
dev.hdaa.1.nid27_config: 0x02211030 as=3 seq=0 device=Headphones conn=Jack ctype=1/8 loc=Front color=Black misc=0
dev.hdaa.1.nid27: pin: Headphones (Black Jack)
dev.hdaa.1.nid26_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid26_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid26: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid25_original: 0x02a11c50 as=5 seq=0 device=Mic conn=Jack ctype=1/8 loc=Front color=Black misc=12
dev.hdaa.1.nid25_config: 0x02a11c50 as=5 seq=0 device=Mic conn=Jack ctype=1/8 loc=Front color=Black misc=12
dev.hdaa.1.nid25: pin: Mic (Black Jack)
dev.hdaa.1.nid24_original: 0x01813c40 as=4 seq=0 device=Line-in conn=Jack ctype=1/8 loc=Rear color=Blue misc=12
dev.hdaa.1.nid24_config: 0x01813c40 as=4 seq=0 device=Line-in conn=Jack ctype=1/8 loc=Rear color=Blue misc=12
dev.hdaa.1.nid24: pin: Line-in (Blue Jack)
dev.hdaa.1.nid23: vendor widget [DISABLED]
dev.hdaa.1.nid22_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid22_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid22: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid21_original: 0x99130120 as=2 seq=0 device=Speaker conn=Fixed ctype=ATAPI loc=Onboard color=Unknown misc=1
dev.hdaa.1.nid21_config: 0x99130120 as=2 seq=0 device=Speaker conn=Fixed ctype=ATAPI loc=Onboard color=Unknown misc=1
dev.hdaa.1.nid21: pin: Speaker (Fixed)
dev.hdaa.1.nid20_original: 0x01014010 as=1 seq=0 device=Line-out conn=Jack ctype=1/8 loc=Rear color=Green misc=0
dev.hdaa.1.nid20_config: 0x01014010 as=1 seq=0 device=Line-out conn=Jack ctype=1/8 loc=Rear color=Green misc=0
dev.hdaa.1.nid20: pin: Line-out (Green Jack)
dev.hdaa.1.nid19: vendor widget [DISABLED]
dev.hdaa.1.nid18: vendor widget [DISABLED]
dev.hdaa.1.nid17: vendor widget [DISABLED]
dev.hdaa.1.nid16: vendor widget [DISABLED]
dev.hdaa.1.nid15: vendor widget [DISABLED]
dev.hdaa.1.nid14: audio mixer
dev.hdaa.1.nid13: audio mixer
dev.hdaa.1.nid12: audio mixer
dev.hdaa.1.nid11: audio mixer
dev.hdaa.1.nid10: vendor widget [DISABLED]
dev.hdaa.1.nid9: audio input
dev.hdaa.1.nid8: audio input
dev.hdaa.1.nid7: vendor widget [DISABLED]
dev.hdaa.1.nid6: audio output [DISABLED]
dev.hdaa.1.nid5: vendor widget [DISABLED]
dev.hdaa.1.nid4: audio output
dev.hdaa.1.nid3: audio output
dev.hdaa.1.nid2: audio output
dev.hdaa.1.%parent: hdacc1
dev.hdaa.1.%pnpinfo: type=0x01 subsystem=0x103c3647
dev.hdaa.1.%location: nid=1
dev.hdaa.1.%driver: hdaa
dev.hdaa.1.%desc: Realtek ALC662 Audio Function Group
dev.hdaa.0.reconfig: 0
dev.hdaa.0.gpo_config:
dev.hdaa.0.gpo_state:
dev.hdaa.0.gpio_config:
dev.hdaa.0.gpio_state:
dev.hdaa.0.gpi_state:
dev.hdaa.0.config: forcestereo,ivref50,ivref80,ivref100,ivref,vref
dev.hdaa.0.nid9: audio output
dev.hdaa.0.nid8: audio output
dev.hdaa.0.nid7_original: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid7_config: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid7: pin: Digital-out (None) [DISABLED]
dev.hdaa.0.nid6_original: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid6_config: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid6: pin: Digital-out (None) [DISABLED]
dev.hdaa.0.nid5_original: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid5_config: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid5: pin: Digital-out (Jack)
dev.hdaa.0.nid4_original: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid4_config: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid4: pin: Digital-out (Jack)
dev.hdaa.0.%parent: hdacc0
dev.hdaa.0.%pnpinfo: type=0x01 subsystem=0x1043847b
dev.hdaa.0.%location: nid=1
dev.hdaa.0.%driver: hdaa
dev.hdaa.0.%desc: NVIDIA (0x001c) Audio Function Group
dev.hdaa.%parent:
dev.hdacc.1.%parent: hdac1
dev.hdacc.1.%pnpinfo: vendor=0x10ec device=0x0662 revision=0x01 stepping=0x01
dev.hdacc.1.%location: cad=0
dev.hdacc.1.%driver: hdacc
dev.hdacc.1.%desc: Realtek ALC662 HDA CODEC
dev.hdacc.0.%parent: hdac0
dev.hdacc.0.%pnpinfo: vendor=0x10de device=0x001c revision=0x01 stepping=0x00
dev.hdacc.0.%location: cad=0
dev.hdacc.0.%driver: hdacc
dev.hdacc.0.%desc: NVIDIA (0x001c) HDA CODEC
dev.hdacc.%parent:
dev.hdac.1.polling: 0
dev.hdac.1.pindump: 0
dev.hdac.1.%parent: pci0
dev.hdac.1.%pnpinfo: vendor=0x8086 device=0x3a6e subvendor=0x103c subdevice=0x3647 class=0x040300
dev.hdac.1.%location: slot=27 function=0
dev.hdac.1.%driver: hdac
dev.hdac.1.%desc: Intel 82801JD HDA Controller
dev.hdac.0.polling: 0
dev.hdac.0.pindump: 0
dev.hdac.0.%parent: pci1
dev.hdac.0.%pnpinfo: vendor=0x10de device=0x0e08 subvendor=0x1043 subdevice=0x847b class=0x040300
dev.hdac.0.%location: slot=0 function=1
dev.hdac.0.%driver: hdac
dev.hdac.0.%desc: NVIDIA GF119 HDA Controller
dev.hdac.%parent:

Code: 
pcm0: <NVIDIA (0x001c) (HDMI/DP 8ch)> (play)
pcm1: <NVIDIA (0x001c) (HDMI/DP 8ch)> (play)
pcm2: <Realtek ALC662 (Rear Analog)> (play/rec)
pcm3: <Realtek ALC662 (Analog)> (play/rec) default
pcm4: <Realtek ALC662 (Front Analog Headphones)> (play)

I know I can change the default pcm device so that I get sound only from the speakers or only from the jakc headphones, but can I force this change while the OS is already running?

Thanks for reading and help!

~Andy
 
Yes, it's settable at runtime. You can e.g. run sysctl hw.snd.default_unit=4 to use your Headphones as default sound device.
 
You can also put the rear speakers and front headphone jack in the same "as" grouping. A seq=15 on the headphone jack will be sensed and mute the rear speakers when the headphones are plugged in - no need to toggle the default sound unit.

rear speakers as=1 seq=0
front headphone jack as=1 seq=15

Edited: an as=0 disables the pin
 
tobik said:
Yes, it's settable at runtime. You can e.g. run sysctl hw.snd.default_unit=4 to use your Headphones as default sound device.
Click to expand...
I tried this and it doesn't work. While the OS recognizes the new default and I can adjust the volumes, somehow sound still plays from the previous default. Could be something wrong with my setup, though.

shepper said:
You can also put the rear speakers and front headphone jack in the same "as" grouping. A seq=15 on the headphone jack will be sensed and mute the rear speakers when the headphones are plugged in - no need to toggle the default sound unit.

rear speakers as=0 seq=0
front headphone jack as=0 seq=15
Click to expand...
Will test this and report back with an update.

EDIT:
I set the following in my /boot/device.hints file:
Code: 
hint.hdaa.1.pcm3.nid21.config="as=0"
hint.hdaa.1.pcm3.nid25.config="as=0"
hint.hdaa.1.pcm4.nid27.config="as=0 seq=15"

Following the information found in the output of:
dmesg | grep pcm
Code: 
pcm0: <NVIDIA (0x001c) (HDMI/DP 8ch)> at nid 4 on hdaa0
pcm1: <NVIDIA (0x001c) (HDMI/DP 8ch)> at nid 5 on hdaa0
pcm2: <Realtek ALC662 (Rear Analog)> at nid 20 and 24 on hdaa1
pcm3: <Realtek ALC662 (Analog)> at nid 21 and 25 on hdaa1
pcm4: <Realtek ALC662 (Front Analog Headphones)> at nid 27 on hdaa1
pcm0: <NVIDIA (0x001c) (HDMI/DP 8ch)> at nid 4 on hdaa0
pcm1: <NVIDIA (0x001c) (HDMI/DP 8ch)> at nid 5 on hdaa0
pcm2: <Realtek ALC662 (Rear Analog)> at nid 20 and 24 on hdaa1
pcm3: <Realtek ALC662 (Analog)> at nid 21 and 25 on hdaa1
pcm4: <Realtek ALC662 (Front Analog Headphones)> at nid 27 on hdaa1
pcm0: <NVIDIA (0x001c) (HDMI/DP 8ch)> at nid 4 on hdaa0
pcm1: <NVIDIA (0x001c) (HDMI/DP 8ch)> at nid 5 on hdaa0
pcm2: <Realtek ALC662 (Rear Analog)> at nid 20 and 24 on hdaa1
pcm3: <Realtek ALC662 (Analog)> at nid 21 and 25 on hdaa1
pcm4: <Realtek ALC662 (Front Analog Headphones)> at nid 27 on hdaa1

However, this doesn't work.
 
Atsuri said:
I tried this and it doesn't work. While the OS recognizes the new default and I can adjust the volumes, somehow sound still plays from the previous default. Could be something wrong with my setup, though.
Click to expand...
Ah ok. No that does not work. Your application needs to reopen /dev/dsp. It needs to support this. Only restarting your app will help. shepper's method is better anyway for your use case.
 
My understanding is the the pcm devices are allocated during boot with the driver taking its best guess as to how things are grouped. If you know otherwise you can reset the groupings as described in snd_hda(4)
Atsuri said:
hint.hdaa.1.pcm3.nid21.config="as=0"
hint.hdaa.1.pcm3.nid25.config="as=0"
hint.hdaa.1.pcm4.nid27.config="as=0 seq=15"
Click to expand...
.

I also have not seen any examples where an "as" bridges two devices although as=0 disables a pin. If nid21 has a default as=1 then group nid27 with it (as=1) and use seq=15 so that plugging in the headphones mutes the lower nid21.


If you use pcm3 as the default sound unit, I would try just the following single line in /boot/device.hints
Code: 
hint.hdac.1.cad0.nid27.config="as=1 seq=15"
or
Code: 
hint.hdaa.1.cad0.nid27.config="as=1 seq=15"

Edited.
 
Thank you very much for help, everyone! :) In the end the solution turned out to be trivial, but slightly unexpected (to me).
I had to place the headphones front jack in the same association group as the on-board speaker, because association group ac=0 was already occupied by the system beeper.

The following lines in /boot/device.hints worked for me:
Code: 
hint.hdac.1.cad0.nid21.config="as=2 seq=0"
hint.hdac.1.cad0.nid27.config="as=2 seq=15"

Here is the output of sysctl -a | grep hda after introducing the changes:
Code: 
device    snd_hda
dev.pcm.3.%parent: hdaa1
dev.pcm.2.%parent: hdaa1
dev.pcm.1.%parent: hdaa0
dev.pcm.0.%parent: hdaa0
dev.hdaa.1.reconfig: 0
dev.hdaa.1.gpo_config:
dev.hdaa.1.gpo_state:
dev.hdaa.1.gpio_config: 0=keep 1=keep
dev.hdaa.1.gpio_state: 0=disabled 1=disabled
dev.hdaa.1.gpi_state:
dev.hdaa.1.config: forcestereo,ivref50,ivref80,ivref100,ivref,vref
dev.hdaa.1.nid38: vendor widget [DISABLED]
dev.hdaa.1.nid37: vendor widget [DISABLED]
dev.hdaa.1.nid36: vendor widget [DISABLED]
dev.hdaa.1.nid35: audio mixer
dev.hdaa.1.nid34: audio mixer
dev.hdaa.1.nid33: vendor widget [DISABLED]
dev.hdaa.1.nid32: vendor widget [DISABLED]
dev.hdaa.1.nid31: vendor widget [DISABLED]
dev.hdaa.1.nid30_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid30_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid30: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid29_original: 0x40028201 as=0 seq=1 device=Line-out conn=None ctype=1/4 loc=0x00 color=Purple misc=2
dev.hdaa.1.nid29_config: 0x40028201 as=0 seq=1 device=Line-out conn=None ctype=1/4 loc=0x00 color=Purple misc=2
dev.hdaa.1.nid29: beep widget
dev.hdaa.1.nid28_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid28_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid28: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid27_original: 0x02211030 as=3 seq=0 device=Headphones conn=Jack ctype=1/8 loc=Front color=Black misc=0
dev.hdaa.1.nid27_config: 0x0221102f as=2 seq=15 device=Headphones conn=Jack ctype=1/8 loc=Front color=Black misc=0
dev.hdaa.1.nid27: pin: Headphones (Black Jack)
dev.hdaa.1.nid26_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid26_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid26: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid25_original: 0x02a11c50 as=5 seq=0 device=Mic conn=Jack ctype=1/8 loc=Front color=Black misc=12
dev.hdaa.1.nid25_config: 0x02a11c50 as=5 seq=0 device=Mic conn=Jack ctype=1/8 loc=Front color=Black misc=12
dev.hdaa.1.nid25: pin: Mic (Black Jack)
dev.hdaa.1.nid24_original: 0x01813c40 as=4 seq=0 device=Line-in conn=Jack ctype=1/8 loc=Rear color=Blue misc=12
dev.hdaa.1.nid24_config: 0x01813c40 as=4 seq=0 device=Line-in conn=Jack ctype=1/8 loc=Rear color=Blue misc=12
dev.hdaa.1.nid24: pin: Line-in (Blue Jack)
dev.hdaa.1.nid23: vendor widget [DISABLED]
dev.hdaa.1.nid22_original: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid22_config: 0x411111f0 as=15 seq=0 device=Speaker conn=None ctype=1/8 loc=Rear color=Black misc=1
dev.hdaa.1.nid22: pin: Speaker (None) [DISABLED]
dev.hdaa.1.nid21_original: 0x99130120 as=2 seq=0 device=Speaker conn=Fixed ctype=ATAPI loc=Onboard color=Unknown misc=1
dev.hdaa.1.nid21_config: 0x99130120 as=2 seq=0 device=Speaker conn=Fixed ctype=ATAPI loc=Onboard color=Unknown misc=1
dev.hdaa.1.nid21: pin: Speaker (Fixed)
dev.hdaa.1.nid20_original: 0x01014010 as=1 seq=0 device=Line-out conn=Jack ctype=1/8 loc=Rear color=Green misc=0
dev.hdaa.1.nid20_config: 0x01014010 as=1 seq=0 device=Line-out conn=Jack ctype=1/8 loc=Rear color=Green misc=0
dev.hdaa.1.nid20: pin: Line-out (Green Jack)
dev.hdaa.1.nid19: vendor widget [DISABLED]
dev.hdaa.1.nid18: vendor widget [DISABLED]
dev.hdaa.1.nid17: vendor widget [DISABLED]
dev.hdaa.1.nid16: vendor widget [DISABLED]
dev.hdaa.1.nid15: vendor widget [DISABLED]
dev.hdaa.1.nid14: audio mixer
dev.hdaa.1.nid13: audio mixer
dev.hdaa.1.nid12: audio mixer
dev.hdaa.1.nid11: audio mixer
dev.hdaa.1.nid10: vendor widget [DISABLED]
dev.hdaa.1.nid9: audio input
dev.hdaa.1.nid8: audio input
dev.hdaa.1.nid7: vendor widget [DISABLED]
dev.hdaa.1.nid6: audio output [DISABLED]
dev.hdaa.1.nid5: vendor widget [DISABLED]
dev.hdaa.1.nid4: audio output
dev.hdaa.1.nid3: audio output
dev.hdaa.1.nid2: audio output
dev.hdaa.1.%parent: hdacc1
dev.hdaa.1.%pnpinfo: type=0x01 subsystem=0x103c3647
dev.hdaa.1.%location: nid=1
dev.hdaa.1.%driver: hdaa
dev.hdaa.1.%desc: Realtek ALC662 Audio Function Group
dev.hdaa.0.reconfig: 0
dev.hdaa.0.gpo_config:
dev.hdaa.0.gpo_state:
dev.hdaa.0.gpio_config:
dev.hdaa.0.gpio_state:
dev.hdaa.0.gpi_state:
dev.hdaa.0.config: forcestereo,ivref50,ivref80,ivref100,ivref,vref
dev.hdaa.0.nid9: audio output
dev.hdaa.0.nid8: audio output
dev.hdaa.0.nid7_original: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid7_config: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid7: pin: Digital-out (None) [DISABLED]
dev.hdaa.0.nid6_original: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid6_config: 0x585600f0 as=15 seq=0 device=Digital-out conn=None ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid6: pin: Digital-out (None) [DISABLED]
dev.hdaa.0.nid5_original: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid5_config: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid5: pin: Digital-out (Jack)
dev.hdaa.0.nid4_original: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid4_config: 0x185600f0 as=15 seq=0 device=Digital-out conn=Jack ctype=Digital loc=0x18 color=Unknown misc=0
dev.hdaa.0.nid4: pin: Digital-out (Jack)
dev.hdaa.0.%parent: hdacc0
dev.hdaa.0.%pnpinfo: type=0x01 subsystem=0x1043847b
dev.hdaa.0.%location: nid=1
dev.hdaa.0.%driver: hdaa
dev.hdaa.0.%desc: NVIDIA (0x001c) Audio Function Group
dev.hdaa.%parent:
dev.hdacc.1.%parent: hdac1
dev.hdacc.1.%pnpinfo: vendor=0x10ec device=0x0662 revision=0x01 stepping=0x01
dev.hdacc.1.%location: cad=0
dev.hdacc.1.%driver: hdacc
dev.hdacc.1.%desc: Realtek ALC662 HDA CODEC
dev.hdacc.0.%parent: hdac0
dev.hdacc.0.%pnpinfo: vendor=0x10de device=0x001c revision=0x01 stepping=0x00
dev.hdacc.0.%location: cad=0
dev.hdacc.0.%driver: hdacc
dev.hdacc.0.%desc: NVIDIA (0x001c) HDA CODEC
dev.hdacc.%parent:
dev.hdac.1.polling: 0
dev.hdac.1.pindump: 0
dev.hdac.1.%parent: pci0
dev.hdac.1.%pnpinfo: vendor=0x8086 device=0x3a6e subvendor=0x103c subdevice=0x3647 class=0x040300
dev.hdac.1.%location: slot=27 function=0
dev.hdac.1.%driver: hdac
dev.hdac.1.%desc: Intel 82801JD HDA Controller
dev.hdac.0.polling: 0
dev.hdac.0.pindump: 0
dev.hdac.0.%parent: pci1
dev.hdac.0.%pnpinfo: vendor=0x10de device=0x0e08 subvendor=0x1043 subdevice=0x847b class=0x040300
dev.hdac.0.%location: slot=0 function=1
dev.hdac.0.%driver: hdac
dev.hdac.0.%desc: NVIDIA GF119 HDA Controller
dev.hdac.%parent:

For everyone else having similar problems, all of the information is available in sysctl -a :).
 
My previous post had an error: an as=0 disables a pin. With an empty /boot/device.hints you could re-run
# sysctl -a | grep hda and determine the as= value for nid21. Then reassign nid27 to be in the same as= group as nid21 with a seq=15.
 
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