Dear ALSA users,

please tell me if I should open a ticket for this issue in the ALSA
bugtracking system.

Using PulseAudio (PA) playing sound works without problems but running a
program accessing the microphone (`gnome-volume-control`, `empathy`
doing voice calls, …) causes high CPU loads of PulseAudio.

I reported this to the PulseAudio tracker as ticket #758 [1]. Debugging
this further this led to the following debug message by PA [2].

        $ pulseaudio -k # `autospawn = 0` in `~/.pulse/client.conf`
        $ LANG=C pulseaudio -vvvvv # `gnome-volume-control` started in
        other terminal. ConsoleKit messages removed.
        […]
        I: alsa-source.c: Increasing wakeup watermark to 361.50 ms
        W: ratelimit.c: 52071 events suppressed
        D: memblock.c: Pool full
        D: memblock.c: Pool full
        D: memblock.c: Pool full
        D: memblock.c: Pool full
        I: alsa-source.c: Overrun!
        […]

Searching for this error message on the WWW suggested that this is
related to the ALSA driver and somewhere it was suggested to load the
module with the option `position_fix=1`.

        $ more /etc/modprobe.d/snd-hda-intel.conf 
        options snd_hda_intel position_fix=1

After this change programs accessing the microphone do not cause high
CPU loads anymore [3].

Is that the correct way to fix this problem? Is a quirk for my chip
needed to enable this option automatically?

I did not find a section for VIA chips in `HD-Audio-Models.txt` [4] as
suggested on the »Help To Debug Intel HDA« wiki page [5]. But this
appears to be not needed anyways since I am actually using a Realtek
ALC662 codec chip [6].

I am using Debian Sid/unstable with the following Linux kernel

        $ uname -a 
        Linux name 2.6.32-trunk-amd64 #1 SMP Sun Jan 10 07:51:13 UTC 2010 
x86_64 GNU/Linux

but a 32-bit userspace with `libasound2` 1.0.21a-1 installed.

You will find further information about my system at the end of this
message.


Thanks,

Paul


[1] http://pulseaudio.org/ticket/758
[2] http://pulseaudio.org/ticket/758#comment:11
[3] http://pulseaudio.org/ticket/758#comment:12 
[4] 
http://git.alsa-project.org/?p=alsa-kernel.git;a=blob;f=Documentation/sound/alsa/HD-Audio-Models.txt;hb=HEAD
[5] 
http://www.alsa-project.org/main/index.php/Help_To_Debug_Intel_HDA#Reporting_problems
[6] [Alsa-user] What modules to use for VIA VT1708/A [Azalia HDAC]?
  
http://sourceforge.net/mailarchive/forum.php?thread_name=1265458849.3776.115.camel%40mattotaupa&forum_name=alsa-user

$ lspci -vvnn | grep -A10 Audio
20:01.0 Audio device [0403]: VIA Technologies, Inc. VT1708/A [Azalia HDAC] (VIA 
High Definition Audio Controller) [1106:3288] (rev 10)
        Subsystem: ASUSTeK Computer Inc. Device [1043:8290]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 17
        Region 0: Memory at fbffc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel

$ ls -l /proc/asound/
dr-xr-xr-x 6 root root 0  6. Feb 15:17 card0
-r--r--r-- 1 root root 0  6. Feb 15:17 cards
-r--r--r-- 1 root root 0  6. Feb 15:17 devices
-r--r--r-- 1 root root 0  6. Feb 15:17 hwdep
-r--r--r-- 1 root root 0  6. Feb 15:17 modules
dr-xr-xr-x 2 root root 0  6. Feb 15:17 oss
-r--r--r-- 1 root root 0  6. Feb 15:17 pcm
dr-xr-xr-x 2 root root 0  6. Feb 15:17 seq
-r--r--r-- 1 root root 0  6. Feb 15:17 timers
-r--r--r-- 1 root root 0  6. Feb 15:17 version
lrwxrwxrwx 1 root root 5  6. Feb 15:17 VT82xx -> card0

$ ls -l /proc/asound/card0
-r--r--r-- 1 root root 0  6. Feb 15:18 codec#0
-r--r--r-- 1 root root 0  6. Feb 15:18 id
-rw-r--r-- 1 root root 0  6. Feb 15:18 oss_mixer
dr-xr-xr-x 3 root root 0  6. Feb 15:18 pcm0c
dr-xr-xr-x 3 root root 0  6. Feb 15:18 pcm0p
dr-xr-xr-x 3 root root 0  6. Feb 15:18 pcm1c
dr-xr-xr-x 3 root root 0  6. Feb 15:18 pcm1p

$ more /proc/asound/card0/codec#0
Codec: Realtek ALC662 rev1
Address: 0
Function Id: 0x1
Vendor Id: 0x10ec0662
Subsystem Id: 0x10438290
Revision Id: 0x100101
No Modem Function Group found
Default PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
GPIO: io=2, o=0, i=0, unsolicited=1, wake=0
  IO[0]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
  IO[1]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
Node 0x02 [Audio Output] wcaps 0x1d: Stereo Amp-Out
  Amp-Out caps: ofs=0x40, nsteps=0x40, stepsize=0x03, mute=0
  Amp-Out vals:  [0x40 0x40]
  Converter: stream=0, channel=0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Node 0x03 [Audio Output] wcaps 0x1d: Stereo Amp-Out
  Amp-Out caps: ofs=0x40, nsteps=0x40, stepsize=0x03, mute=0
  Amp-Out vals:  [0x40 0x40]
  Converter: stream=0, channel=0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Node 0x04 [Audio Output] wcaps 0x1d: Stereo Amp-Out
  Amp-Out caps: ofs=0x40, nsteps=0x40, stepsize=0x03, mute=0
  Amp-Out vals:  [0x40 0x40]
  Converter: stream=0, channel=0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Node 0x05 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x06 [Audio Output] wcaps 0x211: Stereo Digital
  Converter: stream=0, channel=0
  Digital:
  Digital category: 0x0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0x1e]: 16 20 24 32
    formats [0x1]: PCM
Node 0x07 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x08 [Audio Input] wcaps 0x10011b: Stereo Amp-In
  Amp-In caps: ofs=0x09, nsteps=0x1f, stepsize=0x05, mute=1
  Amp-In vals:  [0x89 0x89]
  Converter: stream=0, channel=0
  SDI-Select: 0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0x6]: 16 20
    formats [0x1]: PCM
  Connection: 1
     0x23
Node 0x09 [Audio Input] wcaps 0x10011b: Stereo Amp-In
  Amp-In caps: ofs=0x09, nsteps=0x1f, stepsize=0x05, mute=1
  Amp-In vals:  [0x18 0x18]
  Converter: stream=0, channel=0
  SDI-Select: 0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0x6]: 16 20
    formats [0x1]: PCM
  Connection: 1
     0x22
Node 0x0a [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x0b [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
  Amp-In vals:  [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] 
[0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80]
  Connection: 9
     0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x14 0x15 0x16
Node 0x0c [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x00 0x00]
  Connection: 2
     0x02 0x0b
Node 0x0d [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x00 0x00]
  Connection: 2
     0x03 0x0b
Node 0x0e [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x00 0x00]
  Connection: 2
     0x04 0x0b
Node 0x0f [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x10 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x11 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x12 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x13 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x14 [Pin Complex] wcaps 0x40018d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0001003c: IN OUT HP EAPD Detect
  EAPD 0x2: EAPD
  Pin Default 0x01014010: [Jack] Line Out at Ext Rear
    Conn = 1/8, Color = Green
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x0c
Node 0x15 [Pin Complex] wcaps 0x40018d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x00010034: IN OUT EAPD Detect
  EAPD 0x2: EAPD
  Pin Default 0x411111f0: [N/A] Speaker at Ext Rear
    Conn = 1/8, Color = Black
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x0d
Node 0x16 [Pin Complex] wcaps 0x40018d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x00000034: IN OUT Detect
  Pin Default 0x411111f0: [N/A] Speaker at Ext Rear
    Conn = 1/8, Color = Black
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x0e
Node 0x17 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x18 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x00001734: IN OUT Detect
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x01a19840: [Jack] Mic at Ext Rear
    Conn = 1/8, Color = Pink
    DefAssociation = 0x4, Sequence = 0x0
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x0e
Node 0x19 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x0000173c: IN OUT HP Detect
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x02a19950: [Jack] Mic at Ext Front
    Conn = 1/8, Color = Pink
    DefAssociation = 0x5, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=00, enabled=0
  Connection: 2
     0x0c* 0x0e
Node 0x1a [Pin Complex] wcaps 0x40018d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x00000034: IN OUT Detect
  Pin Default 0x0181304f: [Jack] Line In at Ext Rear
    Conn = 1/8, Color = Blue
    DefAssociation = 0x4, Sequence = 0xf
  Pin-ctls: 0x20: IN
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x0d
Node 0x1b [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0000173c: IN OUT HP Detect
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x02214120: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0xc0: OUT HP VREF_HIZ
  Unsolicited: tag=00, enabled=0
  Connection: 2
     0x0c* 0x0e
Node 0x1c [Pin Complex] wcaps 0x400001: Stereo
  Pincap 0x00000020: IN
  Pin Default 0x593301f0: [N/A] CD at Int ATAPI
    Conn = ATAPI, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x20: IN
Node 0x1d [Pin Complex] wcaps 0x400000: Mono
  Pincap 0x00000020: IN
  Pin Default 0x4005c603: [N/A] Line Out at Ext N/A
    Conn = Optical, Color = UNKNOWN
    DefAssociation = 0x0, Sequence = 0x3
  Pin-ctls: 0x20: IN
Node 0x1e [Pin Complex] wcaps 0x400300: Mono Digital
  Pincap 0x00000010: OUT
  Pin Default 0x99430130: [Fixed] SPDIF Out at Int ATAPI
    Conn = ATAPI, Color = Unknown
    DefAssociation = 0x3, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Connection: 1
     0x06
Node 0x1f [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x20 [Vendor Defined Widget] wcaps 0xf00040: Mono
  Processing caps: benign=0, ncoeff=12
  Processing Coefficient: 0x00
  Coefficient Index: 0x06
Node 0x21 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x22 [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] 
[0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80]
  Connection: 10
     0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x14 0x15 0x16 0x0b
Node 0x23 [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] 
[0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80]
  Connection: 10
     0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x14 0x15 0x16 0x0b
Node 0x24 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x25 [Vendor Defined Widget] wcaps 0xf00000: Mono
Node 0x26 [Vendor Defined Widget] wcaps 0xf00000: Mono

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