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    SubjectRe: 3.19 on Nokia n900: audio quality awful
    On 01/18/2015 02:01 PM, Pavel Machek wrote:
    > Hi!
    >
    > If you have any idea about playback problems, help would be still
    > welcome. I'll have to do bisect, otherwise, and it will not be easy.
    >
    >> In 3.18, sound is nice and clear.
    >>
    >> In 3.19, sound is unusable. It produces nasty tone when it should be
    >> quiet, and there's at least as much noise as is sound.
    >>
    >> Unfortunately, list of mixers also changed (and there's cca 120
    >> settings), but a) it does not work with the old list and b) nothing I
    >> could figure out did make the sound usable. Some setting resulted in
    >> even more noise.
    >>
    >> Any idea what could have caused it?
    >
    > I tried audio recording this time.
    >
    > In 2.6.28-nokia, it is neccessary to set "Input select" na "digital
    > mic", then it works. Input select being in "playback" option makes it
    > easy to miss.
    >
    > In 3.18 and 3.19-rc3, all I can record are zeros.
    >
    > Does playback/recording work for you on OMAP 3430-based machines?

    Same codec (tlv320aic3106) works fine on my am335x and omap-l138 boards.
    BeagleBoard-xM also fine with twl4030 codec.

    I don't have my n900 in hacking mode (it is still in use time-to-time) but
    looking at the dts file: you might want to add ai3x-micbias-vg property to the
    aic3x nodes to select the correct mic bias voltage. I can't recall what is
    appropriate for n900, but 2.6.28-nokia sources might give you the answer.

    --
    Péter


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