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Re: Troubleshooting soundcard distortion

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Clemens Ladisch <clemens@ladisch.de> writes:

> Haines Brown wrote:
>> ... 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.
>
> I don't guess you can fix it by re-adding those lines?

Unfortunately I didn't make a backup of the config file because I just
added an isolated line. In any case, I purged and reinstalled alsa-utils
and should be back to the default. 

>> 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.
>
> This sounds as if some other program might play with the mixer.
> If you have alsamixer open, does anything happen with the sliders?

Since I rebooted, my audio card is no longer default, and so alsamixer
has no effect. 

> Also check the power connection.

Before rebooting just now, I mplayer had no problem playing an .flv file
and producing sound. Since rebooting, my card is no longer the default
device, and mplayer produces no sound as the result. Power connections
thus worked a few minutes ago.  

I now realize that a lot of garbage from dmesg is related to this sound
problem.

  ...
  input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:01.0/0000:01:0$
  input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.0/0000:01:0$
  Adding 31249404k swap on /dev/sda10.  Priority:-1 extents:1 across:31249404k
  EXT4-fs (sda1): re-mounted. Opts: (null)
  sr 4:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
  sr 4:0:0:0: [sr0]  Sense Key : Illegal Request [current]
  ILI
  sr 4:0:0:0: [sr0]  Add. Sense: Illegal mode for this track
  sr 4:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
  end_request: I/O error, dev sr0, sector 0
  Buffer I/O error on device sr0, logical block 0

The set of lines beginning with sr 4:0:0:0 repeats at least a hundred
times. I find this used to show up as a udev bug that affected sound.

I ran # udevadm test /class/block/sr0 but don't see anything obviously
wrong in the return.

What is the proper method to set my sound card to be default rather than
HDA Intel? If I were to make it default I probably can recover sound
with mplayer, which would be instructive. 
 

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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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