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    SubjectALC883 recording troubles...
    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. Plus, the mixer playback->mic-boost
    muting enables/disables mic-boost in recording.

    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?

    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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