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 [ 118.207557] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.207569] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.320512] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 118.334691] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.334702] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.446415] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 118.460595] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.460605] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.573568] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 118.587373] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.587383] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.699358] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 118.713510] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.713532] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.826261] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 118.840298] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.840309] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.952247] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 118.966224] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 118.966237] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [ 118.967615] sd 9:0:0:0: [sdb] Unhandled error code [ 118.967625] sd 9:0:0:0: [sdb] [ 118.967630] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK [ 118.967636] sd 9:0:0:0: [sdb] CDB: [ 118.967639] Write(10): 2a 00 00 00 78 00 00 00 f0 00 [ 118.967657] end_request: I/O error, dev sdb, sector 30720 [ 118.967663] quiet_error: 80 callbacks suppressed [ 118.967669] Buffer I/O error on device sdb, logical block 3840 [ 118.967672] lost page write due to I/O error on sdb [ 118.967681] Buffer I/O error on device sdb, logical block 3841 [ 118.967684] lost page write due to I/O error on sdb [ 118.967689] Buffer I/O error on device sdb, logical block 3842 [ 118.967692] lost page write due to I/O error on sdb [ 118.967697] Buffer I/O error on device sdb, logical block 3843 [ 118.967700] lost page write due to I/O error on sdb [ 118.967705] Buffer I/O error on device sdb, logical block 3844 [ 118.967708] lost page write due to I/O error on sdb [ 118.967713] Buffer I/O error on device sdb, logical block 3845 [ 118.967716] lost page write due to I/O error on sdb [ 118.967721] Buffer I/O error on device sdb, logical block 3846 [ 118.967724] lost page write due to I/O error on sdb [ 118.967729] Buffer I/O error on device sdb, logical block 3847 [ 118.967732] lost page write due to I/O error on sdb [ 118.967736] Buffer I/O error on device sdb, logical block 3848 [ 118.967739] lost page write due to I/O error on sdb [ 118.967744] Buffer I/O error on device sdb, logical block 3849 [ 118.967747] lost page write due to I/O error on sdb [ 119.074680] usb 9-2: reset SuperSpeed USB device number 3 using xhci_hcd [ 119.089095] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936ba80 [ 119.089098] xhci_hcd 0000:02:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800c936bac0 [....] The same drive, connected to USB 2.0 on the same machine, without rebooting, and all is good. Thanks anyway, it was worth the try! -- 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
