From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: trident (Hoontech 4d Wave NX) dropouts with small buffersize.
Date: Fri, 08 Oct 2004 18:39:50 +0200
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To: Oliver Freyd <Oliver.Freyd@gmx.de>
Cc: alsa-devel@lists.sourceforge.net
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At Fri, 8 Oct 2004 09:15:06 +0200,
Oliver Freyd wrote:
> 
> Hello Takashi,
> 
> thanks for your reply!
> 
> On Thu, Oct 07, 2004 at 03:04:34PM +0200, Takashi Iwai wrote:
>  
> > No idea yet, but could you check whether this happens with ALSA native
> > apps?  For example, you can run aplay with --buffer-size and
> > --period-size options.  Pass above values to these options and see
> > whether the playback works.
> > 
> 
> Yes, I've tried that now, if play some sound with aplay, without
> --buffer-size, it works normal. If I use --period-size 512 and
> buffer-size 1024, I get that broken sound. Also with period-size 1024 and 
> buffer-size 2048, I think. Only if I use a buffer-size > 2* period-size
> if works ok.

Hmm, how about the bigger period & buffer sizes?  Try both periods=2
and other cases.

The trident driver handles differently when period_size =
buffer_size/2.  If period_size != buffer_size/2, it allocates an extra
voice for the interrupt source.  So, if the bug occurs only with
periods = 2, it narrows the buggy part.


Takashi


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