[alsa-devel] salsa with noninterleaved needs irqpoll?

[Takashi Iwai]

At Sat, 25 Apr 2009 17:41:23 +0100,
maarten van es wrote:
> 
> >>>
> >>> And what about the sample format?  I looked at the drivers; the two
> >>> sound cards do not have a common sample format.
> >>>
> >>>
> >>> Best regards,
> >>> Clemens
> >>>
> >>
> >
> > Thanks, the problem was indeed that I was setting hwparams that are
> > not supported by the card. I do think salsa lib could return a more
> > relevant error than "operation not permitted" and I'll see if I can
> > come up with something for that.
> > Right now though I am trying to figure out what snd_pcm_writen needs
> > for its second parameter, void** bufs. I get the error "bad address"
> > when passing in an array of pointers to a malloc-ed space big enough
> > to hold a channels' worth of data. Sorry if I am missing obvious
> > documentation about this, but what should I pass for this parameter?
> >
> > Regards
> > Maarten
> >
> 
> Hi again,
> 
> Ok, now I finally got everything working and am asking the following
> mostly out of curiosity. The problem I had with snd_pcm_writen by the
> way has to do somehow with using a chroot environment; everything
> works when directly booting into the uclibc / salsa system. For it to
> work I need to add "irqpoll" to the kernel boot options. Without this,
> the card does not start playing (though no error messages from salsa)
> and after a few seconds the kernel tells me to add irqpoll to the boot
> options. On a glibc / alsa based system everything works fine without
> this option as it does with a c-media card with salsa. What does it do
> and why is it needed with the hdsp 9632 on a system with salsa?

It must be a coincidence that the driver works with alsa without
irqpoll option, then.


Takashi