Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency audio

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To: <linux-audio-user@...>
Date: Wednesday, May 8, 2013 - 12:42 pm

[...]

>>

Hello Carlos,

JACK should now work with the onboard audio if you're using the latest
kernel and firmware updates.

>> Then I tried to start jack with the UA25EX. I pluged the usb/power

You really need an adapter that does at least 2A. Using your laptop to
power a RPi and an USB audio interface most likely won't work.

>> Now I tried to start jack on RPi through Qjackctl on the laptop with

Afaik PulseAudio is not installed by default on the Raspbian image so
I've never encountered this issue myself.

>> So now I have an RPi that can start jack using UA.

I've had the same issue. As you describe later you have to switch the
USB controller to USB 1.1 mode and disable Advanced mode on the UA-25.

[...]

> One step more, this time with success.

The AmpBrownie script definitely needs some more refining. I've forked
it in my GitHub (https://github.com/AutoStatic/ampbrownie) to make the
necessary adjustments so Adam of AmpBrownie can merge them back again.

> Don't know if this success is due to some newer versions it appears to

It's because of the controller switched to USB1.1 mode and your UA-25
running in non-advanced mode. And Jack1 also plays a role, from my
experience it runs better than Jack2 on the RPi.

> I made a backup with dd, of course, and I'm moving towards setting up

Maybe this could be helpful:
https://github.com/AutoStatic/scripts/tree/rpi/rpi
https://github.com/AutoStatic/configs/tree/rpi/rpi

> In the future I have more plans in mind, but for now that's it.

So you're running from an USB stick? I've tried this when testing a RT
kernel but performance was horrible. But maybe this was because of the
RT kernel.

> - 1 4 USB hub on USB port 2 (where external audio card and MIDI-USB

I'm using a powered hub with a 3.7A adapter which is more than enough. I
bought this hub for €3, wouldn't call that expensive ;)

Regards,

Jeremy

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Messages in current thread:
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Carlos sanchiavedraz, (Wed May 8, 12:05 pm)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Jeremy Jongepier, (Wed May 8, 12:42 pm)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Carlos sanchiavedraz, (Tue May 14, 8:06 am)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Jeremy Jongepier, (Tue May 14, 10:07 am)
Re: [LAU] Fwd: Re: Raspberry Pi and real-time, low-latency a..., Carlos sanchiavedraz, (Tue May 14, 11:51 am)