[PD] raspberry pi user experience

[katja]

Hello,

Some people seem to have result with setting lower USB speed on the
Pi, but when I try this, the Pi doesn't even respond to keyboard
anymore. Checking /boot/cmdline.txt with another computer, I'm sure it
is not due to a typo. But the order of settings may be important?
Could anyone copy the full text of /boot/cmdline.txt for me, if you
have keyboard working with lowered USB speed? (I'm not talking about
good audio yet).

Thanks,
Katja


On Sat, Jan 26, 2013 at 8:54 PM, Thomas Grill <gr at grrrr.org> wrote:
> Message to self: it seems that one has to wait for updated RPi USB
> firmware/drivers to get USB 2.0 audio going.
> Obviously the "isochronous transfer mode" as used by audio interfaces is
> currently broken.
> gr~~~
>
>
> 2013/1/26 Thomas Grill <gr at grrrr.org>
>>
>> Hi all,
>> for my USB audio class 2.0 device "Native Instruments Komplete Audio 6" i
>> can't report such good news.
>> There is constant irregular crackling, not only with Pd but also with
>> aplay etc. It seems related to USB bandwidth, since turning on and off the
>> inputs in Pd changes crackling frequency. The dwc_otg.speed setting is not
>> usable for me, since the device is dependent on USB 2.0 operation.
>> Any experiences with USB 2.0 audio devices under ALSA/rpi?
>> thanks,
>> gr~~~
>>
>>
>> 2013/1/26 Cyrille Henry <ch at chnry.net>
>>>
>>> hello,
>>>
>>> I just install raspbian release and update it. then install pd 0.44.1
>>> (without any specific optimisation flag)
>>>
>>> I made the standard optimisation :
>>> * - rtprio 99
>>> * - memlock 1000000000
>>> in /etc/security/limits.conf
>>>
>>> and
>>> dwc_otg.speed=1
>>> in /boot/cmdline.txt
>>> as suggested by miller
>>>
>>> I use a uca222 beringher (that cost about 20 or 25€) sound card.
>>> trying the test audio and midi, there is no click with 10ms audio buffer
>>> (with adc~ enable).
>>>
>>> this is with usb keyboard / mouse combo plugged and graphical interface
>>> (for the system and for pd).
>>>
>>> without X, audiobuf can be as low as 5ms
>>>
>>> having a usb keyboard did not change anything for me.
>>>
>>> i'm very happy
>>>
>>> cheers
>>> c
>>>
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>>
>>
>>
>>
>> --
>> Thomas Grill
>> http://grrrr.org
>
>
>
>
> --
> Thomas Grill
> http://grrrr.org
>
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