On Fri, 5 Jul 2013, Larry Keegan wrote: > Dear Chaps, > > I have a Microsoft Basic Optical mouse. When I used an earlier kernel > (2.6 series) it just worked. However, now that I'm using 3.4.51 it > suffers from USB disconnects and reconnects every 62 seconds precisely. > These disconnects do not occur whilst the mouse device is open. I have > tried two different wired mice in different USB slots of different > computers with different motherboard types, all to no avail. Can you post a usbmon trace showing some of those disconnects and reconnects? > What is interesting is that if I connect either mouse to the computer > via a hub, the timing of the disconnects becomes irregular and > unpredictable. I often find all the devices on the bus (ie. everything > but the root hub) disconnect themselves at much the same time as the > mouse does. Often the mouse doesn't reconnect to the bus. In any case > plugging in either mouse makes that entire bus distinctly unreliable. > This problem is not peculiar to any particular hub model. > > I am using a virgin kernel and am not using a well-known user-space > distribution. I use udev to set up my device nodes, but that's all. To > me, this has a distinct whiff of USB suspend problems. I have attempted > to turn off USB suspend by repeatedly writing 'on' to all the > 'power/control' files under /sys/bus/usb/devices. It did not help. I > also re-compiled the kernel with power management and usb suspend > support removed. This didn't help either. That's a pretty clear indication that USB suspend is _not_ involved. > I'd appreciate some advice. It's possible this is an electrical problem -- the bus may not provide enough power for all the devices on it. 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
