On Thu, 5 Dec 2002, Uros Bizjak wrote:
> Hello!
>
> > I tried setting it to Capture.
> > No joy. ALSA gets wedged just the same as before.
> >
> > By the way, is this DMA Allocation thingy documented anywhere?????
>
> Yes, now it is mentioned in isa/sb/sb16_main.c driver source.
>
> > I had to do a huge find|grep to figure out what this
> > suggestion was referring to. Alsamixer knows nothing
> > of this switch. Amixer knows nothing of this switch.
> > Fortunately alsactl can deal with it.
>
> It is not a IFACE_MIXER switch, but IFACE_PCM type switch.
>
> From the error message you posted about this bug, it looks that driver
> is trying to call prepare() operator on a substream that is still
> in SNDRV_PCM_STATE_RUNNING state. Perhaps Jaroslav could tell us if this
> can happen if hardware pointers are not updated anymore (because sb16 DMA
> engine gets stucked somehow). Do you get an XRUN message in
> /var/log/messages?
Prepare can be called with status different than SNDRV_PCM_STATE_OPEN and
SNDRV_PCM_STATE_RUNNING. You have to call snd_pcm_drop() and
snd_pcm_drain() in this case. Ten second limit is in write() and read()
syscalls, so it's possible that the SB DMA engine is somehow screwed.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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