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    SubjectRe: ALC883 recording troubles...
    Hi Takashi,

    I am still finding this recording +ve saturation on my ALC883 Intel
    HDA sound device with 2.6.27-rc3 (ie ALSA 1.0.17 drivers) and ALSA
    1.0.16-1 libraries on Ubuntu Intrepid.

    The previous workaround still 'gets us out of jail':

    # ./hda-verb /dev/snd/hwC0D0 0x23 SET_AMP_GAIN_MUTE 0x7180
    nid = 0x23, verb = 0x300, param = 0x7180
    value = 0x0

    Note, we see this message "hda_codec: Unknown model for ALC883, trying
    auto-probe from BIOS..." as before on this Asus P5E-VM HDMI
    motherboard with current BIOS.

    How can we improve the situation, as out the box, the front/rear mic
    inputs are (still) useless?

    Many thanks,

    On Sat, Jun 28, 2008 at 11:29 AM, Daniel J Blueman
    <> wrote:
    > On Sat, Jun 28, 2008 at 11:11 AM, Vegard Nossum <> wrote:
    >> On Sat, Jun 28, 2008 at 2:05 AM, Daniel J Blueman
    >> <> wrote:
    >>> As the mic is working fine, but with this variable DC offset, it felt
    >>> like something needed tweaking in the mixer (summation) node. I
    >>> understand more about the node connectivity now, and found muting the
    >>> front mic mixer input and setting LR gain to 0 at mixer node 23h
    >>> addresses the issue:
    >>> (from page 42 at
    >>> # ./hda-verb /dev/snd/hwC0D0 0x23 SET_AMP_GAIN_MUTE 0x7180
    >> Are you saying that this fixes the problem completely for you?
    > Yes, this addresses the problem squarely. The front mix mixer input is
    > adding this offset, looks like they have a capacitor between a
    > reference voltage and the pin or something, so it floats up.
    >>> Vegard - your HD bus enumeration looks similar and I'd bet the vendor
    >>> followed the same Realtek application note, so can you give this a
    >>> shot too? If not, try mixer node 20h.
    >> I agree. Thanks for the link, I found ALC268 now as well, and I am
    >> experimenting...
    >> I think 23h is [in]correct -- this is the one with caps f00040h for me too.
    >> But neither of them had any effect at all.
    > OK, I'll take another look at the debug output you posted; I forgot
    > you aren't using the ALC883.
    Daniel J Blueman

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