On Wed, 26 Mar 2014, Peter Münster wrote: > On Wed, Mar 26 2014, Alan Stern wrote: > > > Please try running the test again. When it finishes, go to the > > /sys/kernel/debug/usb/ohci/0000:00:12.1/ directory and post a copy of > > the "registers" file. > > > > Check the contents of that file several times; in the line that says > > "hcca frame", the value should change over time. Does it? > > Yes, it does. > > Please find attached the kernel messages and the output of this command: > > while sleep 1; do date; cat registers; echo; done >/tmp/registers.log Oops -- I just realized that the instructions I sent you before were incomplete. Please try running the same test again, but this time issue the following commands to suspend the device: echo on >/sys/bus/usb/devices/4-2/power/control echo 0 >/sys/bus/usb/devices/4-2/bConfigurationValue echo auto >/sys/bus/pci/devices/0000:00:12.1/power/control echo auto >/sys/bus/usb/devices/4-2/power/control Then a few seconds later, the following command to resume the device: echo on >/sys/bus/usb/devices/4-2/power/control Without the write to the PCI device, the USB controller did not go into suspend and so it wasn't a valid test. As for the changing hcca frame value, that was just a wild guess on my part. Still, if you find it's _not_ changing after this new test, that would explain the problem you experienced. 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
