Hi Daniel and linux-usb, 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. Steps to reproduce: 1. connect a USB soundcard (Audio4DJ used) to a USB 3.0 port (NEC uPD720200 xHCI used) 2. try to play a sound: aplay -D plughw:Audio4DJ sound.wav 3. system (cpu 0) locks up The bug happens everytime on v3.0-7530-gde96355 and also on v3.0.0. I cannot easily test older kernels due to EFI bugs. More information including hang screenshots, dmesg, lcpci and lsusb can be found in the bug report [1]. [1] https://bugzilla.kernel.org/show_bug.cgi?id=40702 Regards, Matěj Laitl -- 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
