On Mon, 3 Feb 2014, Josh Bendavid wrote: > > This shows one of two things: Either your OHCI controller isn't working > > right (it's issuing IRQs when it's not supposed to) or some other > > hardware component in your PC is using IRQ 21 when it's not supposed > > to. > > > > Here's how to tell which is the case. Enable CONFIG_DUMMY_IRQ in the > > kernel. Then shortly after booting, before the "nobody cared" error > > occurs, do this: > > > > echo 0000:00:06.0 >/sys/bus/pci/drivers/ohci-pci/unbind > > modprobe dummy-irq irq=21 > > > > If the "nobody cared" error still occurs, this will prove that the OHCI > > controller isn't at fault; something else is. If it doesn't occur, > > this will prove that the OHCI controller is malfunctioning. > Indeed doing this the number of interrupts stops increasing, and no error > occurs. The dmesg contains the output below. This therefore means that > there is a problem with the controller? Would you suggest I try the > possible workaround patch you had posted earlier? The dmesg output is normal. And yes, lack of any error does indicate that something is wrong with your controller. I don't think this problem can be fixed by a simple workaround. I've been considering adding an I/O watchdog to ohci-hcd, because it ought to help with some issues experienced by other people with buggy OHCI controllers. It's _possible_ that this might also help with your problem -- without knowing exactly what is going wrong in the hardware, I can't say for certain. For now, you may be able to bypass the problem by getting a USB-2 hub and plugging the infrared and Logitech receivers into it rather than directly into the computer. 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
