On 10/30/2013 07:01 PM, jml@xxxxxxxxxx wrote: >> Gesendet: Mittwoch, 30. Oktober 2013 um 18:11 Uhr >> Von: "Daniel Mack" <zonque@xxxxxxxxx> >> On 10/30/2013 02:42 PM, jml@xxxxxxxxxx wrote: >>>> On 10/30/2013 11:39 AM, jml@xxxxxxxxxx wrote: >>>>>> On 10/30/2013 09:17 AM, jml@xxxxxxxxxx wrote: >> >>>>> Sequence Error!(hcd_frame=10797 ep=8in;wait=2,frame=3). Most >>>>> probably some urb of usb-frame 2 is still missing. Cause could be >>>>> too long delays in usb-hcd interrupt handling. >>>> >>>> We've recently fixed this by removing some code. Please try this >>>> patch: >>>> >>>> >>>> https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=a9d14bc0b188a822e42787d01e56c06fe9750162 >>>> >>> Ok, I applied the patch and recompiled the module. dmesg now shows no >>> error but I still get the input/output error. >> >> Hmm, then I don't know right now. You should try some other USB audio >> device such as a headset, just to see whether the USB host controller >> has a general problem with isochronous transfers and such. If that works >> fine, I guess someone needs to look into the usx2y driver. > > A Behringer UCG102 works without problems. Can you advice me on what to do to debug the error? You can check whether the driver sends out packets at all (usb_submit_urb()) and if they succeed. Maybe the Raspberry is even powerful enough to create usbmon traces that you can analyze in wireshark. Read Documentation/usb/usbmon.txt for more information on that topic. Sorry I can't of more concrete help atm. Daniel ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
