[ARMedslack] Improving USB audio sound quality on the Dockstar

[Claudio Cavalera]

On 05/05/2011, Andrzej Telszewski <atelszewski at gmail.com> wrote:
> On 05/05/2011 10:32 AM, Thorsten Mühlfelder wrote:
>> Hi,
>>
>> I'm using a high quality USB audio device (Burr-Brown Japan PCM2702) with
>> my
>> Dockstar. I've configured mpd to use the hardware interface without dmix
>> because dmix seems to be broken on the ARM platform.
>>
>> But there is one problem left: sometimes clicks and pops can be heard.
>> They
>> appear randomly up to 2 times a minute. My impression is that hard disk
>> data
>> transfer causes them, because using "hdparm -t" makes the situation worse.
>> On
>> the Dockstar all USB devices are connected via hub to the same USB
>> controller:
>> # lsusb
>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
>> Bus 001 Device 003: ID 0bc2:2120 Seagate RSS LLC
>> Bus 001 Device 005: ID 08bb:2702 Texas Instruments Japan Speakers
>>
>> Is it possible to give the USB audio data transfers a higher priority?
>>
>
> Hi,
>
> You might try 'chrt', but you need to find the process(es) ID(s)
> responsible for all the audio stuff. Eventually, check here:
>
> http://subversion.ffado.org/wiki/IrqPriorities
>
> but it's rather about real-time Linux.
>
> --
> Pozdrawiam,
> Best regards,
> Andrzej Telszewski
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