[mythtv-users] FE sound stopped working - Update 2

Mike Carron jmcarron at starstream.net
Thu Mar 27 04:24:28 UTC 2014

On 3/26/2014 8:54 PM, Mike Carron wrote:
> On 3/26/2014 8:42 PM, Mike Carron wrote:
>> On 3/26/2014 7:21 PM, Jean-Yves Avenard wrote:
>>> On 27 March 2014 11:00, Mike Carron <jmcarron at starstream.net> wrote:
>>>> I temporarily switched one FE from my production MBE to a test 
>>>> setup where
>>>> I'm going to attempt to upgrade from 0.25 to 0.27 in the next day 
>>>> or so.
>>>> After I switched it back to the production MBE all was fine for 
>>>> about 15
>>>> minutes and then sound output ceased. The first thing I did was go 
>>>> to Setup,
>>>> verified that nothing had changed and ran the speaker test which 
>>>> was good.
>>>> I'm writing this from a Windows machine where I can't conveniently 
>>>> grab the
>>>> frontend log but at the same time as the sound disappeared a set of 
>>>> 4 error
>>>> messages started appearing in the log:
>>>>      ALSA: setting hardware buffer size to 128
>>>>      ALSA: Error opening /proc/asound/card0/pcm3p/sub0/prealloc: 
>>>> Permission
>>>> denied
>>>>      ALSA: Tryto manually increase audio buffer size...
>>>>      ALSA: Unable to sufficiently increase ALSA hardware buffer size -
>>>> underruns are likely
>>>> Those four error messages repeat regularly as long as I'm trying to 
>>>> play
>>>> something. I've searched various threads dealing with ALSA, buffer 
>>>> size and
>>>> related issues and have not found anything that resembles my 
>>>> situation.
>>>> Any thoughts on where I might look?
>>> You can ignore those.
>>> They aren't error as such, just a hint that you may have buffer 
>>> underruns.
>>> You haven't reported the problems you are having.
>>> What exactly is happening?
>>> you have no audio, no video what?
>>> _______________________________________________
>> ***
>> Sorry, my description was a bit hidden.
>> About 15 minutes into watching a live program the sound suddenly 
>> ceased. I went from completely normal sound to no sound at all. I 
>> changed channels and also tried playing a recording - all silent.
>> I mentioned switching between backends just in case that activity 
>> could have unforeseen side effects.
>> mike
>> _______________________________________________
> ***
> Disregard my previous. After an earlier reboot had failed to fix the 
> problem I shut that unit down for several hours. I just now restarted 
> it and MAGIC!, the sound is once again normal. It will be on for the 
> rest of the evening and I'll see if/when it goes silent again.
> For what it's worth, the unit in question is a Zotac ZBOX AD03. I had 
> already purchased two of them before I heard of Mythtv and had no idea 
> the wonderful problems ahead of me with ATI drivers.
> mike
> _______________________________________________
15 minutes into watching and the unit went silent again. At this point 
I'm about convinced that it is a hardware issue. I'll likely give it one 
more chance tomorrow morning and then it will be hardware replacement time.


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