My USB 2.0 soundcard (E-MU 040) works fine in the lastest Raspbian without any tweaks.<br>I'm thus not sure it has to be with USB itself.<br><br>Cheers,<br><br>Pierre.<br><br><div class="gmail_quote">2013/1/27 katja <span dir="ltr"><<a href="mailto:katjavetter@gmail.com" target="_blank">katjavetter@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
Some people seem to have result with setting lower USB speed on the<br>
Pi, but when I try this, the Pi doesn't even respond to keyboard<br>
anymore. Checking /boot/cmdline.txt with another computer, I'm sure it<br>
is not due to a typo. But the order of settings may be important?<br>
Could anyone copy the full text of /boot/cmdline.txt for me, if you<br>
have keyboard working with lowered USB speed? (I'm not talking about<br>
good audio yet).<br>
<br>
Thanks,<br>
Katja<br>
<div class="HOEnZb"><div class="h5"><br>
<br>
On Sat, Jan 26, 2013 at 8:54 PM, Thomas Grill <<a href="mailto:gr@grrrr.org">gr@grrrr.org</a>> wrote:<br>
> Message to self: it seems that one has to wait for updated RPi USB<br>
> firmware/drivers to get USB 2.0 audio going.<br>
> Obviously the "isochronous transfer mode" as used by audio interfaces is<br>
> currently broken.<br>
> gr~~~<br>
><br>
><br>
> 2013/1/26 Thomas Grill <<a href="mailto:gr@grrrr.org">gr@grrrr.org</a>><br>
>><br>
>> Hi all,<br>
>> for my USB audio class 2.0 device "Native Instruments Komplete Audio 6" i<br>
>> can't report such good news.<br>
>> There is constant irregular crackling, not only with Pd but also with<br>
>> aplay etc. It seems related to USB bandwidth, since turning on and off the<br>
>> inputs in Pd changes crackling frequency. The dwc_otg.speed setting is not<br>
>> usable for me, since the device is dependent on USB 2.0 operation.<br>
>> Any experiences with USB 2.0 audio devices under ALSA/rpi?<br>
>> thanks,<br>
>> gr~~~<br>
>><br>
>><br>
>> 2013/1/26 Cyrille Henry <<a href="mailto:ch@chnry.net">ch@chnry.net</a>><br>
>>><br>
>>> hello,<br>
>>><br>
>>> I just install raspbian release and update it. then install pd 0.44.1<br>
>>> (without any specific optimisation flag)<br>
>>><br>
>>> I made the standard optimisation :<br>
>>> * - rtprio 99<br>
>>> * - memlock 1000000000<br>
>>> in /etc/security/limits.conf<br>
>>><br>
>>> and<br>
>>> dwc_otg.speed=1<br>
>>> in /boot/cmdline.txt<br>
>>> as suggested by miller<br>
>>><br>
>>> I use a uca222 beringher (that cost about 20 or 25€) sound card.<br>
>>> trying the test audio and midi, there is no click with 10ms audio buffer<br>
>>> (with adc~ enable).<br>
>>><br>
>>> this is with usb keyboard / mouse combo plugged and graphical interface<br>
>>> (for the system and for pd).<br>
>>><br>
>>> without X, audiobuf can be as low as 5ms<br>
>>><br>
>>> having a usb keyboard did not change anything for me.<br>
>>><br>
>>> i'm very happy<br>
>>><br>
>>> cheers<br>
>>> c<br>
>>><br>
>>> _______________________________________________<br>
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>><br>
>><br>
>><br>
>><br>
>> --<br>
>> Thomas Grill<br>
>> <a href="http://grrrr.org" target="_blank">http://grrrr.org</a><br>
><br>
><br>
><br>
><br>
> --<br>
> Thomas Grill<br>
> <a href="http://grrrr.org" target="_blank">http://grrrr.org</a><br>
><br>
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