Re: [LAU] Google TV device w/ AV out

On Tue, July 2, 2013 12:44 am, Jeremy Jongepier wrote:
> On 07/01/2013 04:12 PM, Patrick Shirkey wrote:
>> IIUC the potential issues with period sizes with non powers of two are
>> at
>> the application level. JACK is agnostic about it.
>>
>
> Yes, guitarix for instance doesn't like period sizes that are not a
> power of two.
>
>> Anyway it's a little spooky that you get better performance with -p64
>> than
>> -p128 even in playback only mode.
>
> Well I'm testing and haven't done any real stress-tests yet. Maybe it
> was a one-off. At least I get undistorted sound out of this device. Now
> if I could only figure out why JACK bails out every once so often.

Does this happen with or without wifi enabled?

> And
> why full-duplex doesn't work, well, it works but the audio coming out is
> distorted.
>

System load causing distortion on the Audio device in duplex mode. It
suggests something is wrong with the bus and or interrupts but I don't see
why it would be ok in playback only mode. Not sure if it is related but I
have noticed that my old usb quattro often takes a while to warm up.
Sometimes I have to run it for a few hours and start/stop jack several
times to get undistorted output.

Another issue is the Rockchip devs probably haven't tested the device at
low latency with duplex mode so they haven't picked up that issue. We can
try flagging it with them.

I forgot what the audio chipset is. Can you post the output of cat
/proc/asound/cards?

--
Patrick Shirkey
Boost Hardware Ltd
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