On Wed, 21 Sep 2016, Ritesh Raj Sarraf wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > Hi Alan, > > On Tue, 2016-09-20 at 10:16 -0400, Alan Stern wrote: > > This is a lot better. No more I/O errors. > > > > We still have irregular suspends and resumes, but that's to be > > expected. More worrying are the spontaneous disconnects. They don't > > seem to be related to the suspend/resume activity. > > > > You can disable suspend for this device entirely by doing: > > > > echo on >/sys/bus/usb/devices/2-4/power/control > > > > I'm afraid that this won't prevent the device from disconnecting > > itself, though. This appears to be some sort of hardware bug that > > can't be fixed in software. > > I'm not sure what you were referring to when you said "No more I/O errors". I was referring to the attempts at I/O while the device was suspended. They didn't occur in your most recent test. > But I still got these errors today, with all patches applied. > > Sep 21 14:58:11 learner kernel: usb 2-4: new high-speed USB device number 98 > using xhci_hcd > Sep 21 14:58:18 learner kernel: usb 2-4: new high-speed USB device number 102 > using xhci_hcd > Sep 21 14:58:24 learner kernel: usb 2-4: new high-speed USB device number 106 > using xhci_hcd > Sep 21 14:58:31 learner kernel: usb 2-4: new high-speed USB device number 114 > using xhci_hcd > Sep 21 14:58:41 learner kernel: usb 2-4: new high-speed USB device number 12 > using xhci_hcd > Sep 21 14:58:41 learner kernel: usb 2-4: device descriptor read/64, error -71 > Sep 21 14:58:41 learner kernel: usb 2-4: device descriptor read/64, error -71 > Sep 21 14:58:41 learner kernel: usb 2-4: new high-speed USB device number 13 > using xhci_hcd These are a completely different kind of error. They occurred during a reset, which followed one of those spontaneous disconnects. Probably the cause of the disconnect is also the cause of these errors. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
