On Fri, Aug 2, 2013 at 8:40 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > 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? > Yep - it's underway... The webcam does have an audio aspect to it tho - in that it has a built-in mic. They are on different busses. James -- 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
