On Wed, 21 May 2014, Heinz Diehl wrote: > On 21.05.2014, Alan Stern wrote: > > > Maybe the problem involves USB-3 Link Power Management. Unfortunately > > there isn't any way I know of to disable it without rebuilding the > > kernel. > > No problem. > > > The patch below will disable LPM for all devices. You can try it and > > see if it helps. > > Recompiled 3.14.4 with your patch applied. Unfortunately, the > faulty behaviour is still the same. This appears in dmesg when > starting to write to the HDD (just a short cut): > > [....] > [ 117.949623] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 > [ 118.062888] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd > [ 118.077765] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 > [ 118.077776] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 > [ 118.193739] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd By the way, those warning messages from xhci_hcd are really meant for debugging. You can ignore them -- not that it will help. > [....] > > The same drive, connected to USB 2.0 on the same machine, without > rebooting, and all is good. In that case, I have no idea what else could be causing the problem. > Thanks anyway, it was worth the try! 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
