Date: Sun, 27 Apr 2003 17:30:53 -0700 From: "Cliff L. Biffle" <cbiffle@safety.net> To: current@freebsd.org Subject: vchans seem to affect /dev/dsp* availability Message-ID: <200304271730.53960.cbiffle@safety.net>
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When I have vchans enabled, every few attempts at opening /dev/dsp* result in 'Operation not supported by device.' Also, while they're enabled, some programs (most reproduceably artsd) peg my CPU after outputting sound data in certain situations. Disabling vchans fixes the problem. The problem's a little ephemeral, so I'm still collecting hard data, but it seems I have to go all the way to properly disable them, e.g. kldload snd_pcm sysctl hw.snd.maxautovchans=0 kldload snd_<my card> Simply turning them off after the drivers have been loaded does not seem sufficient. I've been seeing this on my laptop since I -currentified it, which was early this month. I dismissed it as CS4281-specific until it began happening on my desktop with a recent build, on both a VIA VT8235-style AC97 chip -and- my SBLive. Thoughts? I'm going to try reverting a few of the source files to see if it resolves itself, but pointers from those involved would be much appreciated. Thanks! -Cliff L. Biffle
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