sound problem

Steve O'Hara-Smith steve at
Mon Aug 7 02:10:50 PDT 2006

On Sun, 6 Aug 2006 22:34:10 -0700 (PDT)
Matthew Dillon <dillon at xxxxxxxxxxxxxxxxxxxx> wrote:

> :Playing sound using pcm(4)/snd(4) gives bad quality: hiss and hops, like sound isn't playing for very short time periods.
> :
> :This is experienced:
> : - not having SMP in kernel config (eg GENERIC)
> : - from dfly-1.5 26th December '05 (24th is ok using kernels from chlamydia);
> :including HEAD.
> :
> :dfly-1.4 is ok, including 1.4.4.
> :
> :Using audio/mpg123 for MP3, 'cp test.raw /dev/dspW' or pcmplay for decoded sound.
> :Buffering audio data with mpg123 -b doesn't sound like making any difference.
> :
> :CPU load doesn't sound like making any difference.
> :Problem experienced on several systems, using snd_via8233 and snd_ich.
> :
> :No X11 used.
> :
> : -thomas
>     Hmm.  That's quite odd.  There aren't any significant source code changes
>     bewteen the 24th and 26th of December (I diff'd the 23rd and 27th to be
>     conservative).

	Equally odd is that I have been using sound regularly on -PREVIEW
throughout the 1.3, 1.5 and now into the 1.7 stages with no problems using
snd_via8233. Perhaps the problem is not in the sound code but interference
from elsewhere. One thought that comes to mind is to check that DMA hasn't
got turned off on the discs.

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