On Fri, 2 Aug 2013, James Stone wrote: > >>>> > Okay, so the USB controllers do share IRQ lines. Were you using the > >>>> > other USB buses when the errors occurred? > >>>> > >>>> Webcam microphone might have been on. > >>> > >>> You should try testing with no other USB activity going on. Just in > >>> case. > >>> > >> > >> Not yet tried this, but I have tested the latest bios, and still get > >> the same lockup. Full function-trace attached. > > > > OK . I have now tested with the webcam disconnected, and I don't seem > > to be able to get this bug to occur. > > > > Ah - and on plugging the webcam in, it happened immediately. Is the webcam on the same bus as the audio card or a different bus? I assume a different one, because the usbmon traces showed no signs of traffic to or from a webcam. Also, this doesn't explain why plugging in the webcam should interfere with audio. If the webcam's driver was leaving interrupts disabled for too long, it should have shown up in the irqsoff output. Can you try applying the two patches posted by Steve and Peter and then seeing if the irqsoff report shows anything interesting when you plug in the webcam? Alan Stern -- 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
