On Sat, 16 Apr 2016, Victor Porton wrote: > If this is a bug in the UPS, you can make a workaround in Linux. > > It is known that rebooting the computer helps. So there should be a way > to do the same without rebooting, automatically. Sure. But not in the kernel. The kernel doesn't know that anything is wrong; all it knows is that the UPS isn't responding. As far as the kernel knows, maybe the UPS wasn't _supposed_ to respond. The responsibility for recovering lies with the program that's communicating with the UPS. According to your log, that would be blazer_usb. You should ask the people who maintain that program to add a workaround. Resetting the device would probably work. 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