On Sat, 14 Mar 2015, Louis Sautier wrote: > Hello, I am running into an issue with my USB UPS. The symptoms are > exactly the same as the ones described by this user: > http://comments.gmane.org/gmane.comp.monitoring.nut.user/8888 > I'll still describe what I experience: my UPS stops responding > periodically (as in approximately once or twice a day but it seems to > vary a lot). Running upsc returns "Error: Data stale" > The kernel logs contain the following lines: > [686576.884561] ohci-pci 0000:00:13.0: frame counter not updating; disabled > [686576.884564] ohci-pci 0000:00:13.0: HC died; cleaning up > [686576.884611] usb 5-2: USB disconnect, device number 2 > Unplugging and plugging the UPS again does nothing. I managed to get > it working again by unbinding and binding it: > echo 0000:00:13.0 | tee /sys/bus/pci/drivers/ohci-pci/unbind > /sys/bus/pci/drivers/ohci-pci/bind > Nut's developer seems to think that this might be a kernel issue so I > thought I would ask for advice here. > The UPS is the only device connected to the bus: > $ lsusb -s 05: > Bus 005 Device 002: ID 0463:ffff MGE UPS Systems UPS > Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub > I am running an x86_64 3.19.0-aufs kernel on an AMD FX(tm)-8320, nut > 2.7.2, libusb 1.0.19 and libusb-compat 0.1.5 (I don't know which of > the two is actually used). > I attached my kernel config, let me know if you need anything else. Those kernel log messages indicate that your USB controller has a hardware problem. Like the message says, the controller has stopped working. When you unbind the controller and rebind it, that performs a reset and the controller starts working again. If you want, you could avoid using the bad controller by getting a USB-2.0 hub and plugging the UPS into 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
