On Tue, 6 Oct 2015, Eugen Rogoza wrote: > > The only way to turn off Link Power Management currently is to disable > > CONFIG_PM entirely. > > I recompiled the 4.2.0 having disabled CONFIG_PM: > > # CONFIG_PM is not set > > This time there were no observable disconnects after just plugging in > the device and not doing anything else (like mounting). However, a > disconnect happened much later while browsing the directory structure > on a mounted FS of the HDD. Surprisingly, the disconnects do not > strictly correlate with the load: some heavy copying and seeking back > and forth in a HD movie worked just fine. Therefore I think the > disconnect would have happened on an idle connection as well. Okay, so Link Power Management isn't the answer. > Below is a fresh trace. The reason for the disconnect is > URB_INTERRUPT again (triggered in packet #2473): You've got it backward. The disconnect isn't _caused_ by the interrupt URB; rather, the interrupt URB _reports_ the disconnect to the kernel. In other words, the disconnect occurs first and then the interrupt URB completes. 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
