Date: Tue, 23 Dec 2003 03:35:03 -0000 From: Scott Long <scottl@freebsd.org> To: Daniel Eischen <eischen@vigrid.com> Cc: current@freebsd.org Subject: Re: Looping sound output from pcm Message-ID: <3FE7B78C.7060200@freebsd.org> In-Reply-To: <Pine.GSO.4.10.10312222226400.4189-100000@pcnet5.pcnet.com> References: <Pine.GSO.4.10.10312222226400.4189-100000@pcnet5.pcnet.com>
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Daniel Eischen wrote: > 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. > > > I found an Allegro-1 PCI card on eBay, hopefully it won't get bid out of my price range. Unfortunately, I don't have the cash (nor does my wife have the sanity) to buy another laptop =-) There are rumors of Maestro-3 PCI mule cards in the wild. If someone has one (Cameron?), I'll gladly purchase it. Scott
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