CMI8338/8738 PCI sound chip - recording problem

From: Xiong Jiang (jxiong@gwu.edu)
Date: Sat Feb 12 2000 - 17:06:52 EST

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    Dear all,

    I am awefully sorry that I have to drop in and interrupt you with
    this question. It is simply so itching -- I've got to try IBM
    ViaVoice under Linux and Chinese language dictation -- one of my
    dream with Linux, but it simply can't record anything.

    (I am a Chinese and ViaVoice could be ideal for me to write Chinese
    Linux doc or living event reports.)

    Yes, CMI8338/8738 chips ARE supported by cmpci.o in RedHat 6.1 or
    later Mandrake distribution. I can happily playing MP3 in XMMS with it.
    My problem is recording.

    Motherboard:
            PC100 (from a small Taiwan company maybe) integrated
            with CMI8738 PCI and PCtel micromodem.
    Platform:
            RedHat 6.1
    Config:
            Automatically done by sndconfig. The audio sample sounds
            awefully harsh, but XMMS and gmixer works fine (with the
            playing back settings).
    Problem:
            Can't record anything from any sources. But mic input can be
            heard in headphone, volumn/mute adjustment OK.

            dd /dev/audio > sample.au and then
            cat sample.au > /dev/dsp (the extact command I use is copied
            from Sound-HOWTO, didn't remember extactly here, (I am in Windoz)).
            produce nothing but quietness.

            cat /dev/sndstat shows "no such device"
            no /proc/sound file,

    cat /proc/modules: (sorry can't remember the details
            cmpci
            sound_core

    cat /proc/interrupts /proc/ioports, cmpci shows up there too.

    What could be the problem ? I wrote an email to the author of
    cmpci.c but got no responce. Should I have to reverse engine
    Windoz driver and check cmpci.c line by line to find the reason ?
    Could I debug a loadable kernel module without too much disturbing
    of my normal use ?

    Best regards,
    Xiong Jiang

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