On Mon, 23 Dec 2019, AceLan Kao wrote: > > > you'll encounter the below errors sometime. > > > After the issue happens, have to re-plug the USB cable to recover. > > > > > > [ 837.483573] hub 2-3:1.0: hub_ext_port_status failed (err = -71) > > > [ 837.490889] hub 2-3:1.0: hub_ext_port_status failed (err = -71) > > > [ 837.506780] usb 2-3-port4: cannot disable (err = -71) > > > > You need to do a better job of figuring out why these errors occur. It > > is not connected to the resume delay; there must be a different reason. > > Hint: This is the sort of error you would expect to see if the kernel > > tried to resume a device while its parent hub was still suspended. > Once this error shows, the USB port doesn't work until re-plug the cable. > I have no idea what else I can do to this, do you have any idea that I > could try? > Thanks. Maybe you can collect a usbmon trace showing what happens when the error occurs. There's probably something going on that you aren't aware of. Alan Stern
