On Mon, Apr 09, 2012 at 10:32:12AM +0200, dpc@xxxxxxxxxx wrote: > Hi, > > I'm using Logitech K520 keyboard M310 mouse, wirelessly connected > to unifying receiver. > > If I plug the receiver into usb-switch the computer crashes, in average > after 30 minutes. The crash does not leave any trace on host: sometimes > computer hard-hangs, sometimes it reboots. > > The receiver works fine if connected right into the host. The usb-switch > (I've tried two) works fine with many other devices causing no problems. The > crash does not happen if receiver is plugged via simple usb extension cable, > only plugging it after the usb-switch causes it. > > It took me a while to find a root of this problem as there is no evidence on > what went wrong and it's hard to connect the fact that you just replugged > the receiver somewhere else with a silent reboot few hours ago (yes, > sometimes it can take a while to trigger). I was suspecting other bugs in > kernels or problems with my hardware, but after a lot of testing, I've > finally connected the dots and where able to reproduce this in enough > situations to be sure about this behaviour. > > I've been experiencing the problem with dozens of kernels, tried Ubuntu > 11.10 and 12.04 (beta) so far. Have you tried any kernel.org releases? If you are stuck with Ubuntu kernels, I suggest filing a bug in their bug tracking system and their developers can help you with this much better than we can. If you can try a kernel.org release, please try 3.3.1 and let us know what kernel log messages show up when the crash happens. Also ensure that you aren't running any closed-source graphics drivers, we can't really help you with your kernel if they are running (and they might be the crash problem in the first place.) thanks, greg k-h -- 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
