Date: Mon, 22 Dec 2003 22:28:39 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: Scott Long <scottl@freebsd.org> Cc: current@freebsd.org Subject: Re: Looping sound output from pcm Message-ID: <Pine.GSO.4.10.10312222226400.4189-100000@pcnet5.pcnet.com> In-Reply-To: <3FE7B115.8030808@freebsd.org>
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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@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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