Dear Sarah, > Great, I'm glad your disk works now! > > You can check if the roothub goes into a low power state by watching > whether the parent hub reports U0 or U1/U2 in its port status registers. > You can do this by running > > watch -n 1 'sudo lsusb -v -d 1d6b:0003 | grep "Hub Port Status" -A4' I do not see any change, it always stays in U0. I can also watch the power consumption with powertop and it is quite steady at around 1 Watt. How long is the software-programmed timeout for it to go into a "link idle" state? >> bU1DevExitLat 1 micro seconds >> bU2DevExitLat 0 micro seconds > Interesting. So the device has a non-zero U1 device exit latency, but a > zeroed U2 device exit latency. In that case, we'll only enable U1. > Maybe the device only supports U1? It would be informative to know if > the roothub ports actually go into U1 when the device is plugged > directly into your computer (not through a hub). I am always plugging in the device directly (it is connected to one of the side USB 3.0 ports on an ASUS Zenbook UX21A notebook). Best wishes, Gabor -- 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
