Occasional metallic sound when recording (cs46xx)

["Eloy A. Paris" <peloy@chapus.net>]

Hello,

I am trying to troubleshoot a very annoying problem I have with a Santa
Cruz Turtle Beach (cs46xx). Sometimes, when recording, the recorded
sound is very metallic. If when I get the metallic sound I run alsamixer
and toggle the capture facility of the ADC on and off, sound is fixed
and back to normal.

This problem happens randomly but is very annoying, specially if I
program my PVR (MythTV) to automatically record a show - the show can
get recorded with metallic sound, which makes it very hard to understand
during playback.

This is not MythTV-specific since I have been able to reproduce the
problem using other applications, like the Gnome sound recorder. It is
unrelated to full-duplex operation since when recording a show MythTV
doesn't open /dev/dsp for writing.

I really have no idea about how to troubleshoot this. I don't think
the problem is hardware, but is driver-related instead.

Any suggestions? Are there any debug switches I can enable to get more
information about the problem? I can recompile the drivers and try
anything. I really want to see this fixed, so if anyone has any ideas
to try just let me know.

Thanks,

Eloy.-


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