[alsa-devel] [ISSUE] rtl8192ce appears to interfere with ALSA playback

[Takashi Iwai]

At Thu, 23 Jan 2014 16:50:56 +0000,
LANGLOIS Olivier PIS -EXT wrote:
> 
> >
> > But you passed --buffer-size and --period-size options.
> 
> only to have the same params with hw:0,0 that I am giving with the dmix setup to reproduce the underruns. Otherwise the numbers below are what I have by letting aplay pick them for me by varying only the device.
> 
> I have done a lot of experiments with mildly complex alsa setup during the past holiday [1] to understand that ALSA may come up with different params for different setups but the choosen 16 periods value is puzzling me...

I repeatedly wrote that it's a fixed number.
See src/conf/pcm/dmix.conf.


Takashi


> 
> 1.
> http://mailman.alsa-project.org/pipermail/alsa-devel/2013-December/070561.html
> 
> 
> > >
> > > and I think that usually periods_num ~= buffer_time/period_time or
> > buffer_size/period_size
> > >
> > > aplay -Dhw:0,0 sine_48000.wav
> > >
> > > I have:
> > >
> > >   buffer_size  : 24000
> > >   period_size  : 6000
> > >   period_time  : 125000
> > >
> > > but with the default dmix setup: aplay -v sine_48000.wav:
> > >
> > >   buffer_size  : 16384
> > >   period_size  : 1024
> > >   period_time  : 21333
> >
> > As already mentioned, dmix has the fixed setup for its slave PCM.
> > See src/conf/pcm/dmix.conf.
> >
> >
> > Takashi
> 
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