Distorted sound on Raspberry Pi 2

[Sylvain Garrigues]

Take for instance the latest snapshot:
http://ftp.freebsd.org/pub/FreeBSD/snapshots/arm/armv6/ISO-IMAGES/11.0/FreeBSD-11.0-CURRENT-arm-armv6-RPI2-20160408-r297692.img.xz

All the pcm0 warnings display continuously when playing any sound.

Should I file a bug?

 

> Le 9 avr. 2016 à 11:06, Svatopluk Kraus <onwahe at gmail.com> a écrit :
> 
> Is it recent problem? If yes, some info about kernel version would be
> really nice.
> 
> 
> 
> On Fri, Apr 8, 2016 at 5:28 PM, Sylvain Garrigues
> <sylvain at sylvaingarrigues.com> wrote:
>> Hello,
>> 
>> I have continuous warnings on my Raspberry PI 2 regarding sound when hw.snd.verbose=4:
>> 
>> ...
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=120000, old=120000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=124000, old=124000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=0, old=0 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=4000, old=4000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=8000, old=8000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=12000, old=12000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=16000, old=16000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=16000, old=16000 delta=0 amt=0 ready=8192 free=119808
>> pcm0: WARNING: PCMDIR_PLAY DMA completion too fast/slow ! hwptr=20000, old=20000 delta=0 amt=0 ready=8192 free=119808
>> …
>> 
>> The sound is frequently slightly distorted (like every 5s), and I am trying to figure out why.
>> 
>> To reproduce:
>> # sysctl dev.pcm.0.dest=1
>> # sysctl  hw.snd.verbose=4
>> # mpg123 anympegfile
>> 
>> I still get the warnings on the HDMI output (dev.pcm.0.dest=2) but the sound is not distorted.
>> 
>> Any idea?
>> 
>> Best,
>> Sylvain.
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