Audio volume suddenly very low

Nikolaj Thygesen mailinglist at diamondbox.dk
Sat Jun 25 18:35:09 UTC 2016


Hey Martin,

     I recently bought myself an MSI board with hda/RealTek 0900 - 
running fbsd 10.3/amd64; I experimented like crazy, as I had the exact 
same problem! I discovered, that sound volume was restored after a cold 
boot. Finally, I realized that it was the RealTek win10/amd64 driver 
which caused the trouble (I dual boot Win10/fbsd). So, after booting 
into win10 and then back to fbsd volume had gone low.
     The fix, for me, was replacing the win10 RealTek hda driver with 
the Win10 std class driver - it takes 5 min. Since doing that, I have 
adequate volume in both systems. The RealTek even ruins it for the win 
class driver, so I had to completely shutdown and cold reboot after the 
switch.
     I've had a case running with MSI for a week or two, and it seems 
like they have finally acknowledged the issue, which, as I see it, 
should be handled with a more thorough reset of the chip in BIOS.
     I followed the instructions in this blog:

https://blogs.msdn.microsoft.com/matthew_van_eerde/2010/08/23/troubleshooting-how-to-install-the-microsoft-hd-audio-class-driver/

     br - N :o)

On 06/23/2016 17:51, Martin S. Weber wrote:
> And here's /dev/sndstat with hw.snd.verbose=4, playing to the
> realtek:
>
> FreeBSD Audio Driver (64bit 2009061500/amd64)
> Installed devices:
> pcm0: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm0:play:dsp0.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm0:play:dsp0.p0[pcm0:virtual:dsp0.vp0]: spd 8000/48000, fmt 0x00100008/0x00200010, flags 0x10000000, 0x0000006b
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:4096/128/32]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00100008) -> feeder_format(0x00100008 -> 0x00100010) -> feeder_rate(0x00100010 q:1 8000 -> 48000) -> feeder_matrix(1.0 -> 2.0) -> feeder_volume(0x00200010) -> {hardware}
> pcm1: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm1:play:dsp1.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm1:play:dsp1.p0[pcm1:virtual:dsp1.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm2: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm2:play:dsp2.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm2:play:dsp2.p0[pcm2:virtual:dsp2.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm3: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm3:play:dsp3.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm3:play:dsp3.p0[pcm3:virtual:dsp3.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm4: <Realtek (0x0900) (Rear Analog 5.1/2.0)> on hdaa1  (1p:1v/1r:1v) default
> 	snddev flags=0x2e2<AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm4:play:dsp4.p0]: spd 48000, fmt 0x00200010, flags 0x00002108, 0x00000004
> 	interrupts 1450, underruns 0, feed 1450, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2108<TRIGGERED,BUSY,HAS_VCHAN>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm4:play:dsp4.p0[pcm4:virtual:dsp4.vp0]: spd 44100/48000, fmt 0x00200010, flags 0x1000012c, 0x00000029, pid 1500 (musicpd)
> 	interrupts 0, underruns 0, feed 1616, ready 65536 [b:0/0/0|bs:65536/2048/32]
> 	channel flags=0x1000012c<RUNNING,TRIGGERED,SLEEPING,BUSY,VIRTUAL>
> 	{userland} -> feeder_root(0x00200010) -> feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 -> 48000) -> {hardware}
> 	[pcm4:record:dsp4.r0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000005
> 	interrupts 0, overruns 0, feed 0, hfree 4096, sfree 4096 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{hardware} -> feeder_root(0x00200010) -> feeder_mixer(0x00200010) -> {userland}
> 	pcm4:record:dsp4.r0[pcm4:virtual:dsp4.vr0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{hardware} -> feeder_root(0x00000000) -> {userland}
> pcm5: <Realtek (0x0900) (Front Analog)> on hdaa1  (1p:1v/1r:1v)
> 	snddev flags=0x2e2<AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm5:play:dsp5.p0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm5:play:dsp5.p0[pcm5:virtual:dsp5.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> 	[pcm5:record:dsp5.r0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000005
> 	interrupts 0, overruns 0, feed 0, hfree 4096, sfree 4096 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{hardware} -> feeder_root(0x00200010) -> feeder_mixer(0x00200010) -> {userland}
> 	pcm5:record:dsp5.r0[pcm5:virtual:dsp5.vr0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{hardware} -> feeder_root(0x00000000) -> {userland}
> pcm6: <Realtek (0x0900) (Onboard Digital)> on hdaa1  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm6:play:dsp6.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm6:play:dsp6.p0[pcm6:virtual:dsp6.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm7: <Realtek (0x0900) (Rear Digital)> on hdaa1  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm7:play:dsp7.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm7:play:dsp7.p0[pcm7:virtual:dsp7.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm8: <USB audio> at ? kld snd_uaudio (1p:1v/0r:0v)
> 	snddev flags=0x2e3<SIMPLEX,AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm8:play:dsp8.p0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000004
> 	interrupts 29207, underruns 0, feed 29206, ready 0 [b:3072/1536/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm8:play:dsp8.p0[pcm8:virtual:dsp8.vp0]: spd 44100/48000, fmt 0x00200010, flags 0x10000000, 0x00000029
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:65536/2048/32]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00200010) -> feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 -> 48000) -> {hardware}
>
> File Versions:
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/vchan.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/sound.c 243459 2012-11-23 15:31:00Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/sndstat.c 248381 2013-03-16 17:57:00Z joel $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/mixer.c 271193 2014-09-06 15:24:48Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_volume.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_rate.c 209193 2010-06-15 07:06:54Z avg $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_mixer.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_matrix.c 243138 2012-11-16 07:05:57Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_format.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_eq.c 209193 2010-06-15 07:06:54Z avg $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_chain.c 283950 2015-06-03 15:32:43Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder.c 227293 2011-11-07 06:44:47Z ed $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/dsp.c 283192 2015-05-21 07:48:06Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/channel.c 283950 2015-06-03 15:32:43Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/buffer.c 243450 2012-11-23 13:43:51Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/ac97_patch.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/ac97.c 227293 2011-11-07 06:44:47Z ed $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdacc.c 281963 2015-04-25 01:11:33Z rpaulo $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdac.c 281963 2015-04-25 01:11:33Z rpaulo $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdaa_patches.c 281963 2015-04-25 01:11:33Z rpaulo $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdaa.c 283609 2015-05-27 13:23:02Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/via8233.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/ich.c 216518 2010-12-18 14:21:28Z tijl $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/es137x.c 254263 2013-08-12 23:30:01Z scottl $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/csapcm.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/csa.c 254263 2013-08-12 23:30:01Z scottl $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/cmi.c 254263 2013-08-12 23:30:01Z scottl $
> $FreeBSD: releng/10.3/sys/dev/sound/isa/sndbuf_dma.c 193640 2009-06-07 19:12:08Z ariff $
>
>
> here's playing to the uaudio:
>
> FreeBSD Audio Driver (64bit 2009061500/amd64)
> Installed devices:
> pcm0: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm0:play:dsp0.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm0:play:dsp0.p0[pcm0:virtual:dsp0.vp0]: spd 8000/48000, fmt 0x00100008/0x00200010, flags 0x10000000, 0x0000006b
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:4096/128/32]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00100008) -> feeder_format(0x00100008 -> 0x00100010) -> feeder_rate(0x00100010 q:1 8000 -> 48000) -> feeder_matrix(1.0 -> 2.0) -> feeder_volume(0x00200010) -> {hardware}
> pcm1: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm1:play:dsp1.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm1:play:dsp1.p0[pcm1:virtual:dsp1.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm2: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm2:play:dsp2.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm2:play:dsp2.p0[pcm2:virtual:dsp2.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm3: <NVIDIA (0x0071) (HDMI/DP 8ch)> on hdaa0  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm3:play:dsp3.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm3:play:dsp3.p0[pcm3:virtual:dsp3.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm4: <Realtek (0x0900) (Rear Analog 5.1/2.0)> on hdaa1  (1p:1v/1r:1v)
> 	snddev flags=0x2e2<AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm4:play:dsp4.p0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000004
> 	interrupts 797, underruns 0, feed 797, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm4:play:dsp4.p0[pcm4:virtual:dsp4.vp0]: spd 44100/48000, fmt 0x00200010, flags 0x10000000, 0x00000029
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:65536/2048/32]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00200010) -> feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 -> 48000) -> {hardware}
> 	[pcm4:record:dsp4.r0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000005
> 	interrupts 0, overruns 0, feed 0, hfree 4096, sfree 4096 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{hardware} -> feeder_root(0x00200010) -> feeder_mixer(0x00200010) -> {userland}
> 	pcm4:record:dsp4.r0[pcm4:virtual:dsp4.vr0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{hardware} -> feeder_root(0x00000000) -> {userland}
> pcm5: <Realtek (0x0900) (Front Analog)> on hdaa1  (1p:1v/1r:1v)
> 	snddev flags=0x2e2<AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm5:play:dsp5.p0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm5:play:dsp5.p0[pcm5:virtual:dsp5.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> 	[pcm5:record:dsp5.r0]: spd 48000, fmt 0x00200010, flags 0x00002100, 0x00000005
> 	interrupts 0, overruns 0, feed 0, hfree 4096, sfree 4096 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x2100<BUSY,HAS_VCHAN>
> 	{hardware} -> feeder_root(0x00200010) -> feeder_mixer(0x00200010) -> {userland}
> 	pcm5:record:dsp5.r0[pcm5:virtual:dsp5.vr0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{hardware} -> feeder_root(0x00000000) -> {userland}
> pcm6: <Realtek (0x0900) (Onboard Digital)> on hdaa1  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm6:play:dsp6.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm6:play:dsp6.p0[pcm6:virtual:dsp6.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm7: <Realtek (0x0900) (Rear Digital)> on hdaa1  (1p:1v/0r:0v)
> 	snddev flags=0x2e7<SIMPLEX,AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
> 	[pcm7:play:dsp7.p0]: spd 48000, fmt 0x00200010, flags 0x00006100, 0x00000004
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:4096/2048/2|bs:4096/2048/2]
> 	channel flags=0x6100<BUSY,HAS_VCHAN,VCHAN_PASSTHROUGH>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm7:play:dsp7.p0[pcm7:virtual:dsp7.vp0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
> 	interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:0/0/0]
> 	channel flags=0x10000000<VIRTUAL>
> 	{userland} -> feeder_root(0x00000000) -> {hardware}
> pcm8: <USB audio> at ? kld snd_uaudio (1p:1v/0r:0v) default
> 	snddev flags=0x200002e3<SIMPLEX,AUTOVCHAN,BUSY,MPSAFE,REGISTERED,VPC,PRIO_WR>
> 	[pcm8:play:dsp8.p0]: spd 48000, fmt 0x00200010, flags 0x00002108, 0x00000004
> 	interrupts 28942, underruns 0, feed 28941, ready 0 [b:3072/1536/2|bs:4096/2048/2]
> 	channel flags=0x2108<TRIGGERED,BUSY,HAS_VCHAN>
> 	{userland} -> feeder_mixer(0x00200010) -> {hardware}
> 	pcm8:play:dsp8.p0[pcm8:virtual:dsp8.vp0]: spd 44100/48000, fmt 0x00200010, flags 0x1000012c, 0x00000029, pid 1500 (musicpd)
> 	interrupts 0, underruns 0, feed 31427, ready 65536 [b:0/0/0|bs:65536/2048/32]
> 	channel flags=0x1000012c<RUNNING,TRIGGERED,SLEEPING,BUSY,VIRTUAL>
> 	{userland} -> feeder_root(0x00200010) -> feeder_volume(0x00200010) -> feeder_rate(0x00200010 q:1 44100 -> 48000) -> {hardware}
>
> File Versions:
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/vchan.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/sound.c 243459 2012-11-23 15:31:00Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/sndstat.c 248381 2013-03-16 17:57:00Z joel $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/mixer.c 271193 2014-09-06 15:24:48Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_volume.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_rate.c 209193 2010-06-15 07:06:54Z avg $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_mixer.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_matrix.c 243138 2012-11-16 07:05:57Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_format.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_eq.c 209193 2010-06-15 07:06:54Z avg $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder_chain.c 283950 2015-06-03 15:32:43Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/feeder.c 227293 2011-11-07 06:44:47Z ed $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/dsp.c 283192 2015-05-21 07:48:06Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/channel.c 283950 2015-06-03 15:32:43Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/buffer.c 243450 2012-11-23 13:43:51Z mav $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/ac97_patch.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pcm/ac97.c 227293 2011-11-07 06:44:47Z ed $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdacc.c 281963 2015-04-25 01:11:33Z rpaulo $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdac.c 281963 2015-04-25 01:11:33Z rpaulo $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdaa_patches.c 281963 2015-04-25 01:11:33Z rpaulo $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/hda/hdaa.c 283609 2015-05-27 13:23:02Z hselasky $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/via8233.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/ich.c 216518 2010-12-18 14:21:28Z tijl $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/es137x.c 254263 2013-08-12 23:30:01Z scottl $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/csapcm.c 193640 2009-06-07 19:12:08Z ariff $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/csa.c 254263 2013-08-12 23:30:01Z scottl $
> $FreeBSD: releng/10.3/sys/dev/sound/pci/cmi.c 254263 2013-08-12 23:30:01Z scottl $
> $FreeBSD: releng/10.3/sys/dev/sound/isa/sndbuf_dma.c 193640 2009-06-07 19:12:08Z ariff $
>
> I'm lost...
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