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Groups > comp.os.linux.hardware > #2727

Troubleshooting soundcard distortion

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I took a day off from work to get an old Audigy SE sound card to work,
and ultimately concluded the card was broken. So yesterday I replaced it
with an Asus Xonar DS PCI Express 7.1. It played beautifully on my
Debian Wheezy out of the box. So I removed the lines in
/etc/modprobe.d/alsa/alsa-base.config that I tried to correct the old
card's priority problem. Today sound is hopeless distorted.

When I play a CD disk with mplayer, the sound stutters. More accurately
the sound is amplitude modulated by a sinewave at about 8Hz/sec. When I
play a .wav file with aply, the sound is a screech. I installed
pulseaudio and it produced no sound at all and so removed it.

I'm uncertain about what driver is loaded. $ dmesg tells me nothing. I
grepped its return for snd_virtuoso, Virtuoso, Ausus and snd. Because
snd_intel.hda surely most have loaded, I can't figure this out. So I
turn to # /var/log/boot | grep virtuosos, Asus, Xonar and see nothing.
A grep snd returns:

  Thu Feb 12 14:23:18 2015: Loading kernel module snd-ctxfi.          

And yet lsmod suggests the module is loaded:

  # lsmod
  ...
  snd_ctxfi              62598  0 
  ...
  snd_hda_codec_hdmi     26352  1 
  snd_virtuoso           33765  2 
  snd_oxygen_lib         27905  1 snd_virtuoso
  snd_mpu401_uart        13299  1 snd_oxygen_lib
  snd_usb_audio          71436  0 
  snd_usbmidi_lib        18801  1 snd_usb_audio
  snd_seq_midi           12744  0 
  snd_seq_midi_event     13124  1 snd_seq_midi
  snd_rawmidi            22472  3 \
    snd_seq_midi,snd_usbmidi_lib,snd_mpu401_uart 
  ...
  snd_hda_intel          21786  1 
  snd_hda_codec          63477  2 snd_hda_intel,snd_hda_codec_hdmi  
  ...
  snd_hwdep              12943  2 snd_hda_codec,snd_usb_audio
  snd_pcm                53461  7 \
  snd_hda_codec,snd_hda_intel,snd_usb_audio,\ 
    snd_oxygen_lib,snd_hda_codec_hdmi,snd_ctxfi
  ...
  snd_page_alloc         12867  3 snd_pcm,snd_hda_intel,snd_ctxfi
  ...
  snd_seq                39512  2 snd_seq_midi_event,snd_seq_midi
  snd_seq_device         13016  3 snd_seq,snd_rawmidi,snd_seq_midi
  snd_timer
  ...
  snd                    42761  19
    snd_timer,snd_seq_device,snd_seq,snd_pcm,snd_hwdep,snd_hda_codec,\
    snd_hda_intel,snd_rawmidi,snd_usbmidi_lib,snd_usb_audio, \
    snd_mpu401_uart,snd_oxygen_lib,snd_virtuoso,snd_hda_codec_hdmi,\
    snd_ctxfi 

If snd_virtuoso is my driver, then it seems to be loaded. I don't know
that oxygen and ctxfi refer to, unless a failed attempt to install a
Creative X-Fi Titaniam left it behind. Oxygen seems an M-Audio driver.

Other information:

    $ uname -a
    Linux engels 3.2.0-4-686-pae #1 SMP Debian 3.2.65-1 i686 GNU/Linux

    # lspci -v
    06:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788 \
            [Oxygen HD Audio]
    Subsystem: ASUSTeK Computer Inc. Virtuoso 100 (Xonar DX)
    Flags: bus master, medium devsel, latency 32, IRQ 19
    I/O ports at d000 [size=256]
    Capabilities: <access denied>
    Kernel driver in use: snd_virtuoso



    

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Thread

Troubleshooting soundcard distortion Haines Brown <haines@engels.histomat.net> - 2015-02-13 13:49 -0500
  Re: Troubleshooting soundcard distortion Clemens Ladisch <clemens@ladisch.de> - 2015-02-16 21:40 +0100
    Re: Troubleshooting soundcard distortion Haines Brown <haines@engels.histomat.net> - 2015-02-16 17:19 -0500
      Re: Troubleshooting soundcard distortion Haines Brown <haines@engels.histomat.net> - 2015-02-17 07:10 -0500
      Re: Troubleshooting soundcard distortion Clemens Ladisch <clemens@ladisch.de> - 2015-02-17 19:56 +0100
        Re: Troubleshooting soundcard distortion Haines Brown <haines@engels.histomat.net> - 2015-02-17 17:13 -0500
          Re: Troubleshooting soundcard distortion Clemens Ladisch <clemens@ladisch.de> - 2015-02-20 22:21 +0100

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