choppy sound (breaks video as well) when playing on PCI card

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Mark Greenwood wrote:
> On Tuesday 21 Apr 2009 22:15:42 H.S. wrote:
>> Hello,
>>
>> Since last several weeks, all audio on my Debian Squeeze system (kernel
>> 2.6.26-2-686) is interrupted with short pauses, making sound choppy. It
>> affects video as well (mplayer, gxine, youtube, etc.). Videos (avi
>> files, youtube videos) and audio and also video telephony is not working
>> properly anymore.
>>
>> I have pulseaudio version 0.9.14-2.
>>
> 
> <snip>
> 
>> Anybody know how to solve this problem?
> 
> I'm guessing, as I don't have that card, but I had similar problems and the following worked for me.
> 
> Try editing /etc/pulse/default.pa and change
> load-module module-hal-detect
> to
> load-module module-hal-detect tsched=0

Aha! You gave the same suggestion as is given in the last paras here:
https://fedoraproject.org/wiki/Features/GlitchFreeAudio#Release_Notes

It has worked to remove the choppyness. But the messages in syslog are
still being logged.

> This switches off the new glitch-free mode which, due to various problems with buggy ALSA drivers and kernels with needlessly high latency, isn't.
> 
> There is a link somewhere which explains this, but I can't find it. It seems my Google finger is broken :)

So the problem is in Alsa actually? Any news if a newer version of alsa
fixes the problem? Also, from various attempts at google searches during
the last several weeks, I have discovered that the problem is not only
on the card that I have, other cards have also exhibited the same.

Thanks.



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