[mythtv-users] Sudden audio problem

Mike Carron jmcarron at starstream.net
Sat Mar 1 16:48:46 UTC 2014

Ok, I tried it this morning after everything had been off for at least 
12 hours, the sound came on properly and lasted about 30 minutes. When 
it died, the settings still pointed to ALSA:hdmi card 0 and a speaker 
test was successful. I exited the FE and checked alsamixer which showed 
the correct settings and was not muted. I restarted the FE and the sound 
was correct and lasted for about 20 minutes. When it went out I checked 
the settings, still ALSA:HDMI card 0, speaker test was still successful, 
and after exiting the FE, alsamixer showed the sound was not muted. This 
time when I restarted the FE, there was no sound.

I'm beginning to suspect a hardware issue, especially since an identical 
AD-03 in a different room but connecting to the same BE has delivered 
proper sound with no problems.


On 2/28/2014 10:38 PM, Jean-Yves Avenard wrote:
> On Saturday, March 1, 2014, Mike Carron <jmcarron at starstream.net 
> <mailto:jmcarron at starstream.net>> wrote:
>     After several months of normal operation, one FE (a Zotac ZBOX
>     AD-03 with Mythbuntu 12.04 0.25/fixes) suddenly dropped sound
>     completely while watching live tv. Checking the log produced 4
>     errors together at the time when the sound was dropped:
>     ALSA: Setting hardware audio buffer size to 128
>     ALSA: Error opening /proc/asound/card0/pcm3p/suub0/prealloc:
>     Permission denied.
>     ALSA: Try to manually increase audio buffer with: echo 128 | sudo
>     tee /proc/asound/card0/pcm3p/sub0/prealloc
>     ALSA: Unable to sufficiently increase ALSA hardware buffer size -
>     underruns are likely
>     I can restart the FE and the same scenario will repeat, some
>     amount of time with completely normal sound followed by silence.
>     Those 4 items will be in the log at the exact time the sound fails.
>     If someone is familiar with this situation and can offer
>     suggestions that would be great.
> Those messages are harmless. You can ignore them.
> Make sure the audio device didn't change in the settings, and that 
> it's not muted using the alsa-mixer utility
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