From owner-freebsd-stable  Sun Nov 12 10:23:16 2000
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Date: Sun, 12 Nov 2000 18:23:07 +0000 (GMT)
From: Andrew Gordon <arg@arg1.demon.co.uk>
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To: Cameron Grant <gandalf@vilnya.demon.co.uk>
Cc: j mckitrick <jcm@FreeBSD-uk.eu.org>, stable@freebsd.org,
	multimedia@freebsd.org
Subject: RE: continuing sound problems with 4.2-beta
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On Fri, 10 Nov 2000, Cameron Grant wrote:

> > I ran into this the other day; it appears that there has been a change in
> > the sound API recently such that you need to do SNDCTL_DSP_SPEED before
> > SNDCTL_DSP_SETFMT.  I haven't had time to dig into CVS to see when this
> > happened or why.
> 
> this is a bug that i cannot replicate.  can you give me more info on your
> hardware?

pcm0: <VIA VT82C686A AC'97 Audio> port
0xe400-0xe403,0xe000-0xe003,0xdc00-0xdcff irq 10 at device 7.5 on pci0


FreeBSD Audio Driver (newpcm) Nov 12 2000 01:08:07
Installed devices:
pcm0: <VIA VT82C686A AC'97 Audio> at io 0xdc00 irq 10 (1p/1r channels
duplex)

This is now running with -stable from yesterday.

However, I think the real problem relates to the AC'97 codec rather than
the VIA chipset - this codec only supports one speed (44KHz).

I have now traced the problem some way into the driver.  The DSP_SETFMT
call never gets as far as the hardware specific driver - it calls
chn_setformat(), which then calls chn_buildfeeder(), which returns EINVAL
from around line 1430:

        for (type = FEEDER_RATE; type <= FEEDER_LAST; type++) {
                if (flags & (1 << type)) {
                        desc.type = type;
                        desc.in = 0;
                        desc.out = 0;
                        desc.flags = 0;
                        DEB(printf("find feeder type %d, ", type));
                        f = feeder_get(&desc);
                        DEB(printf("got %p\n", f));
                        if (f == NULL)
                                return EINVAL;
  



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