On Wed, 2 Oct 2013, [ISO-8859-1] Jorge Mu�Camadro wrote: > Usbmon shows this when plugin the usb external drive: It's all normal up to here... > ffff880213239a80 1383565784 S Ci:1:006:0 s a1 fe 0000 0000 0001 1 < > ffff880213239a80 1383566386 C Ci:1:006:0 0 1 = 01 > ffff880213239a80 1383566512 S Bo:1:006:2 -115 31 = 55534243 01000000 > 24000000 80000612 00000024 00000000 00000000 000000 > ffff880213239a80 1383566536 C Bo:1:006:2 0 31 > > ffff880202ba1780 1383566549 S Bi:1:006:1 -115 36 < This shows the drive telling the computer that it has two logical units. Then the computer sends its first command to the drive, but the drive doesn't send any data back. > I never used usbmon before, so i follow the instructions from > https://www.kernel.org/doc/Documentation/usb/usbmon.txt > Hope this is useful. You did it right. However, the trace doesn't show _why_ the drive failed to respond. One thing I just noticed in your earlier message: > >> [ 1405.646775] usb 1-2: new high-speed USB device number 5 using xhci_hcd Although the drive is USB-3 and is capable of communicating at SuperSpeed (5 Gb/s), it is running at only high speed (480 Mb/s). This suggests there may be something wrong with the cable. Are you using a high-quality USB-3 cable? It's possible that this is a link power management problem. There have been reports of similar problems in that area, and a patch was posted here: http://marc.info/?l=linux-usb&m=138005811528076&w=2 Does the drive work with that patch installed? 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
