Re: [Alsa-user] [pulseaudio-discuss] Pops/Crackles Messing up my audio...

[Nasa <na...@co...>]

----- Original Message -----
> 'Twas brillig, and Nasa at 07/08/11 21:26 did gyre and gimble:
> > Hi,
> >
> > I was hoping I could get some help troubleshooting some audio
> > quality issues I am running into.
> > Specifically, I am getting a lot of *pops/crackles* when I play
> > audio files. It shows up when I
> > move from 2-channel to 4/5 channel audio (via pauvcontrol) - I am
> > using a USB X-FI sound-card with
> > the Meego IVI.
> >
> > I have tried changing the resample method (going from ffmpeg to
> > high-quality) and setting tsched=0,
> > neither making any noticeable difference.
> >
> > The only things I saw in /var/log/messages that seemed relevant was:
> > messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: ALSA
> > woke us up to write new data to the device, but there was actually
> > nothing to write!
> > messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: Most
> > likely this is a bug in the ALSA driver 'snd_usb_audio'. Please
> > report this issue to the ALSA developers.
> > messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: We
> > were woken up with POLLOUT set -- however a subsequent
> > snd_pcm_avail() returned 0 or another value < min_avail.
> >
> > And this was spout out of dmesg
> > [ 21.857184] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00
> > [ 21.897058] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00
> > [ 21.961062] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00
> >
> > I have already eliminated the speakers and the amp (played music
> > from a different source and
> > they sounded fine).
> >
> > Let me know what else I should post (I could record the sound, if
> > that would be useful).
> >
> > Thanks in advance,
> 
> While this could be an issue in the alsa driver itself, can I ask if
> you're applying any volume changes to your streams or sink?
> 
> There could be a problem with optimized paths for software volume
> adjustments. You can disable these optimisations via a special
> environment var: PULSE_NO_SIMD=1

Col,

So I added 

export PULSE_NO_SIMD=1 

into my .bashrc file and rebooted. From the terminal 
"echo $PULSE_NO_SIMD" came back '1' -- however, that didn't
make any difference in the pops/crackles I am hearing :{

Nasa


> 
> It's worth checking this to see if it's that area that's at fault.
> 
> Col
> 
> 
> --
> 
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
> 
> Day Job:
> Tribalogic Limited [http://www.tribalogic.net/]
> Open Source:
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> PulseAudio Hacker [http://www.pulseaudio.org/]
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> 
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