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SubjectRe: ALC883 recording troubles...
At Mon, 9 Jun 2008 20:59:00 +0100,
Daniel J Blueman wrote:
>
> Hi Takashi-san,
>
> I'm experiencing DC offset with the microphone on 2.6.24 (Ubuntu 8.04
> LTS x86-64). I can see on Audacity that the DC offset that varies with
> the recording capture level.

Could you elaborate? The mic bias level could be changed via the pin
control value. Usually, it's set as VREF 80%.

> Plus, the mixer playback->mic-boost
> muting enables/disables mic-boost in recording.

This is a known bug in alsa-lib mixer abstraction. No kernel issue.

> It feels like the ALC883 pins aren't configured quite right. The mobo
> is an Asus P5E-VM with current BIOS [1]
>
> What's the routine to debug this? Would it help to install windows,
> dump the register space and compare?

You can find *.INI file that contains the default pin configuration
in Windows. This might be useful in the case BIOS is broken but
Windows does a black magic.

Anyway, please run alsa-info.sh with --no-upload option and show the
generated file here. It contains the codec information and mixer
setup.
http://hg.alsa-project.org/alsa/raw-file/tip/alsa-info.sh

Also, you can adjust the pin setting on the fly via hda-verb utility
below:
http://ftp.suse.com/pub/people/tiwai/misc/hda-verb-0.2.tar.bz2

Don't forget to build snd-hda-intel module with
CONFIG_SND_HDA_HWDEP=y to use this command.


Takashi

>
> Thanks in advance,
> Daniel
>
> --- [1]
>
> $ sudo lspci -vvvxxxs 0:1b.0
> 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
> Controller (rev 02)
> Subsystem: ASUSTeK Computer Inc. Unknown device 829f
> Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B-
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
> Latency: 0, Cache Line Size: 32 bytes
> Interrupt: pin A routed to IRQ 22
> Region 0: Memory at fe9f8000 (64-bit, non-prefetchable) [size=16K]
> Capabilities: [50] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
> Address: 0000000000000000 Data: 0000
> Capabilities: [70] Express Unknown type IRQ 0
> Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
> Device: Latency L0s <64ns, L1 <1us
> Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
> Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
> Device: MaxPayload 128 bytes, MaxReadReq 128 bytes
> Link: Supported Speed unknown, Width x0, ASPM unknown, Port 0
> Link: Latency L0s <64ns, L1 <1us
> Link: ASPM Disabled CommClk- ExtSynch-
> Link: Speed unknown, Width x0
> 00: 86 80 3e 29 06 00 10 00 02 00 03 04 08 00 00 00
> 10: 04 80 9f fe 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 43 10 9f 82
> 30: 00 00 00 00 50 00 00 00 00 00 00 00 0f 01 00 00
> 40: 01 00 00 07 00 00 00 00 00 00 00 00 00 00 00 00
> 50: 01 60 42 c8 00 00 00 00 00 00 00 00 00 00 00 00
> 60: 05 70 80 00 00 00 00 00 00 00 00 00 00 00 00 00
> 70: 10 00 91 00 00 00 00 10 00 08 10 00 00 00 00 00
> 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> c0: 00 04 00 01 00 00 00 00 31 00 a3 02 00 00 00 00
> d0: 61 00 a3 02 00 00 00 00 00 00 00 00 00 00 00 00
> e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> f0: 00 00 00 00 00 00 00 00 86 0f 02 00 00 00 00 00
>
> $ aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: Intel [HDA Intel], device 0: ALC883 Analog [ALC883 Analog]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 1: ALC883 Digital [ALC883 Digital]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> card 0: Intel [HDA Intel], device 3: ATI HDMI [ATI HDMI]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> card 2: HDMI [HDA ATI HDMI], device 3: ATI HDMI [ATI HDMI]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> daniel@veyron:~$ aplay -L
> default:CARD=Intel
> HDA Intel, ALC883 Analog
> Default Audio Device
> front:CARD=Intel,DEV=0
> HDA Intel, ALC883 Analog
> Front speakers
> surround40:CARD=Intel,DEV=0
> HDA Intel, ALC883 Analog
> 4.0 Surround output to Front and Rear speakers
> surround41:CARD=Intel,DEV=0
> HDA Intel, ALC883 Analog
> 4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=Intel,DEV=0
> HDA Intel, ALC883 Analog
> 5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=Intel,DEV=0
> HDA Intel, ALC883 Analog
> 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=Intel,DEV=0
> HDA Intel, ALC883 Analog
> 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
> null
> Discard all samples (playback) or generate zero samples (capture)
> default:CARD=U0x46d0x990
> USB Device 0x46d:0x990, USB Audio
> Default Audio Device
> front:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> Front speakers
> surround40:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> 4.0 Surround output to Front and Rear speakers
> surround41:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> 4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> 5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
> iec958:CARD=U0x46d0x990,DEV=0
> USB Device 0x46d:0x990, USB Audio
> IEC958 (S/PDIF) Digital Audio Output
> front:CARD=HDMI
> HDA ATI HDMI
> Front speakers
> surround40:CARD=HDMI
> HDA ATI HDMI
> 4.0 Surround output to Front and Rear speakers
> surround41:CARD=HDMI
> HDA ATI HDMI
> 4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=HDMI
> HDA ATI HDMI
> 5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=HDMI
> HDA ATI HDMI
> 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=HDMI
> HDA ATI HDMI
> 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
> --
> Daniel J Blueman
>


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