My USB 2.0 soundcard (E-MU 040) works fine in the lastest Raspbian without any tweaks. I'm thus not sure it has to be with USB itself.
Cheers, Pierre. 2013/1/27 katja <katjavet...@gmail.com> > 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 <g...@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 <g...@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 <c...@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 > >>> > >>> _______________________________________________ > >>> Pd-list@iem.at mailing list > >>> UNSUBSCRIBE and account-management -> > >>> http://lists.puredata.info/listinfo/pd-list > >> > >> > >> > >> > >> -- > >> Thomas Grill > >> http://grrrr.org > > > > > > > > > > -- > > Thomas Grill > > http://grrrr.org > > > > _______________________________________________ > > Pd-list@iem.at mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >
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