Looping sound output from pcm
Daniel Eischen
eischen at vigrid.com
Mon Dec 22 19:28:42 PST 2003
On Mon, 22 Dec 2003, Scott Long wrote:
> Robert Watson wrote:
> > I ran aim after a recent kernel update, and had a rather odd problem. I
> > got an instant message from someone which resulted in a "ding" from aim.
> > However, the ding never stopped dinging -- the sample repeated over and
> > over again, and continues as I type. Even after the aim process exited.
> > Sending additional sound output didn't make it go away either. KDE/arts,
> > etc, don't seem to be involved in the problem, so it really seems like the
> > kernel is looping the sample. When I try to unload pcm, I get:
> >
> > pcm0: unregister: channel pcm0:play:2 busy (pid 965)
> >
> > And there's no pid 965.
> >
> > paprika# cat /dev/sndstat
> > FreeBSD Audio Driver (newpcm)
> > Installed devices:
> > pcm0: <ESS Technology Maestro3> at io 0xd800 irq 5 (4p/1r/0v channels duplex default)
> >
> > Any suggestions welcome; in the mean time, I'll just listen to it ding
> > away ad naueseum.
> >
> > Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
> > robert at fledge.watson.org Senior Research Scientist, McAfee Research
> >
>
> As was pointed out, this is probably an interrupt problem. The sound
> hardware should have interrupted the driver to say that it was almost
> done playing what was in the _ring_ buffer, and the driver should have
> responded by either filling the buffer with new data, or turning off the
> hardware. Instead, the hardware just kept on doing what it was designed
> to do: keep on playing through the ring buffer. The same thing would
> have happened if the OS had crashed while a sample was playing.
>
> The maestro3 driver is growing more stale over time. I no longer have
> any hardware to deal with it though. If anyone knows where I can get
> an Maestro3 or Allegro-1 PCI card, I'll gladly buy it and fix start
> working on the driver again.
If you can get your hands on some not-so-old Dell
laptops. My Lattitude C400 at work has a Maestro3.
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