Date: Mon, 11 Aug 2003 14:39:49 -0600 From: Fred Clift <fclift@verio.net> To: freebsd-multimedia@freebsd.org Subject: pcm problem (static, noise) (re: pr kern/14990, kern/44512) Message-ID: <20030811142015.D63969@irfcn.qzm.berz.irevb.arg>
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Hi. I've been meaning to either track down the problem myself, or ask someone about this for a while. About 1 out of 20 times, when applications try to play audio to my sound card, I get static, that lasts as long as the device is held open. I've noticed this under mpg123, mplayer, xmms and some others. A typical scenario is this: I'm listenting to music with xmms and I get a phone call - I pause xmms, talk on the phone and then unpause xmms. every once in a while I get white noise or static, out of both speakers, instead of the music I expect. Simply pausing my player, and unpausing again will almost always make the problem go away though every now and then it takes a couple of tries.... I note that there are two pr's I've seen that seem to show similar symptoms; kern/14990 and kern/44512. The first is quite old and applies to 4.0-release, and is closed, though after a superficial look at the source it doesn't look like the supplied patch was incorperated into FreeBSD. The second offers no suggestions. In short, my question is, "has kern/14990 been incorperated into the pcm driver? if not, why not? why was this pr closed with no update about eventual resolution or lack thereof?" I'd like to know before I go about merging in those suggested changes to 4.8 or -current. Otherwise, does anyone have any ideas what might be up? I've lived with this for literally, years. I'm getting close to annoyed enough to actually work on it now. A few snippets of useful information.... The sound card is an integraded CS chip on a Dell Optiplex GX1 motherboard, partial dmesg and uname -a below. -------------------------------------------------------------------------- FreeBSD vespa.dmz.orem.verio.net 4.8-STABLE FreeBSD 4.8-STABLE #7: Sat Aug 9 08:02:33 MDT 2003 root@vespa.dmz.orem.verio.net:/usr/obj/usr/src/sys/VESPA i386 pcm0: <CS423x> at port 0x534-0x537,0x388-0x38b,0x220-0x22f irq 5 drq 1,0 on isa0 -------------------------------------------------------------------------- Fred -- Fred Clift - fclift@verio.net -- Remember: If brute force doesn't work, you're just not using enough.
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