On Sun, Aug 7, 2011 at 11:04 PM, Matěj Laitl <matej@xxxxxxxx> wrote: > every time I try to play a sound file though a NI Audio 4 DJ USB soundcard > (snd-usb-caiaq module) that is connected to a NEC Corporation uPD720200 USB > 3.0 Host Controller (xhci-hcd module), the system completely hangs. dmesg > reports stalls or hard lockups on cpu 0; magic-sysrq-key doesn't work, but > tasks on other cpus still apparently run. The card runs in the USB 2.0 (480M) > mode. > > The bug does NOT occur when the same soundcard is connected to a USB 2.0 > (ehci) ports. Non-sound communication with the soundcard works even on USB > 3.0: input mode can be set correctly using amixer. Did you try this with any other USB2 high-speed sound card, a DVB receiver, a webcam or hardware like USB sticks or external HDDs? The device uses isochronous transfers, and the driver doesn't do anything fancy with it, so it would help a lot to know whether other hardware/drivers are also affected. Next thing to try would be whether it makes any difference if you never queue any outbound URBs (in sound/usb/caiaq/audio.c). Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
