Am Samstag, 7. November 2009 18:06:05 schrieb Bruno Prémont: > > When a hub is bus-powered, the USB specification does not allow it to > > provide more than 100 mA to each port. Since the Sandisk pen wants > > more than 100 mA, the kernel rejects its configuration. You can > > override this decision if you want by writing the appropriate config > > value to the pen's /sys/bus/usb/devices/.../bConfigurationValue file. > > That's a not so nice limitation of the spec... It would have been more > useful if the "available" power could be forwarded to a single port of > the HUB even if in that case 0ma remain for the other 3 ports. Suppose we did this and somebody plugs in another device. Do we refuse to service this device? Regards Oliver -- 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
