On Mon, 11 Mar 2013, Frank Peters wrote: > When I boot my x64 Linux system to the console a continuous series > of "USB disconnect/reconnect" messages appears in the kernel log. > The disconnect/reconnect messages concern the USB mouse: > > usb 1-1.3: USB disconnect, device number N > usb 1-1.3: new low-speed USB device number N+1 using ehci-pci > input: Microsoft Microsoft Basic Optical Mouse v2.0 as /devices/pci0000:00/0000:00:1a.0 usb1/1-1/1-1.3/1-1.3:1.0/input/input5 > hid-generic 0003:045E:00CB.0006: input: USB HID v1.11 Mouse [Microsoft Microsoft Basic Optical Mouse v2.0 ] on usb-0000:00:1a.0-1.3/input0 > .... > > These "USB disconnect/reconnect" messages will repeat roughly every 40 seconds > with the device number "N" increasing to "N+1" each time. > > The interesting thing about this behavior is that I can stop the messages, > and presumably the disconnects, by starting the General Purpose Mouse (gpm) > server: > > gpm -m /dev/input/mice -t imps2 > > If I then terminate the gpm server, the USB disconnect/reconnect messages > will start to occur once again. > > The USB disconnects also stop when I start the graphical X server. > > It would seem that if nothing is "grabbing" the USB mouse (i.e. gpm or X) > then the kernel somehow automatically disconnects it. > > My system has the USB built in to the kernel (no modules). > > The motherboard I use is Intel DP55KG which has the P55 Express > chipset to control the USB. > > I've seen this behavior on the current kernel-3.8.x and also > on the previous kernel-3.7. I have not tested anything earlier. > > Please CC to frank.peters@xxxxxxxxxxx as I am not subscribed to > the list. [ adding linux-usb@ to CC ] Do you have USB autosuspend enabled on that device? -- Jiri Kosina SUSE Labs -- 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
