Strange RPi USB Audio Issue

[Michael Zoran]

On Sat, 2016-11-12 at 19:56 +0100, Arne Caspari wrote:
> Hi all!
> 
> I encounter a strange issue while using USB Audio DACs with the  
> raspberry pi:
> 
> In my buildroot environment, I get corrupted audio when using USB
> 2.0  
> audio DACs on the raspberry pi. Every once in a while the audio data
> in  
> the usb packets contain only zeroes for some 10-30 samples which  
> produce audible clicks in the output.
> 
> Now, if I use Raspbian, I can not provoke this issue no matter
> what.  
> The audio is always fine with Raspbian.
> 
> I tried anything I could think of to find a difference between my  
> environment and Raspbian but I did not find the piece of software
> that  
> is relevant for this failure:
> 
> - I used the same kernel image and bootloaders from raspbian in my  
> environment - the issue remains
> - I used my kernel image on raspbian - the issue still does not
> occur  
> there
> - I used the same libasound version like raspbian - the issue remains
> - I use the same cmdline settings for USB like raspbian
> 
> If anybody has an idea what I could try or what might be the
> difference  
> between raspbian and a generic buildroot environment, I would be
> very  
> grateful to hear about it.
> 
> 
> Thanks,
> 
> 
> /Arne
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Silly question, is the hardware the same between different
environments.  For example, do you have exactly the same USB devices
plugged into the RPI in both environments?