Re: Bus resets while realtime job is running

On Sun, 1 Apr 2007, Matthias Urlichs wrote:

> Hi,
> 
> On current kernels (at least 2.6.19 to current -- I can't test older ones),
> realtime processes cause USB resets on my system.
> 
> I'm running pulseaudio with realtime privileges. This happens:
> 
> [23496.395029] usb 6-3.2.1: reset low speed USB device using ehci_hcd and address 42
> [23496.937542] usb 6-3.1: reset low speed USB device using ehci_hcd and address 39
> [23512.660307] usb 6-3.2.1: reset low speed USB device using ehci_hcd and address 42
> [23513.699371] usb 6-3.1: reset low speed USB device using ehci_hcd and address 39
> [23531.379236] usb 6-3.2.1: reset low speed USB device using ehci_hcd and address 42
> [23553.950417] usb 6-3.2.1: reset low speed USB device using ehci_hcd and address 42
> [23565.124676] usb 6-3.2.1: reset low speed USB device using ehci_hcd and address 42
> 
> The devices in question happen to be my mouse and keyboard. :-/
> Unfortunately the keyboard manages not to survive that reset (it starts
> losing events, which is kindof inconvenient when the lost event is a
> key-up) and needs to be unplugged to resume working.
> 
> I don't have audio (or anything else that's active, in fact) on my USB.
> 
> Ideas where to start debugging this are appreciated.

A good place to start would be to use usbmon (see 
Documentation/usb/usbmon.txt).  It also wouldn't hurt to turn on 
CONFIG_USB_DEBUG.

Alan Stern


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