On Mon, 23 Mar 2015, Marc Joliet wrote: > > - If I leave the drive unplugged during boot and plug it in without manually > > loading any modules, nothing happens. That is, the kernel does not log > > anything about the device being attached, and neither the uas nor the > > usb-storage modules are loaded (I did see something happen with usbmon, but I > > accidentally clobbered the file, so I'll have to recapture that). > > Here it is, the entirety of what usbmon captures in this case: > > d24a0240 0.209658 C Ii:2:003:3 0:2 15 = > 20010100 00000000 00000000 000000 > . . . . . . . . . . . . . . > d24a0240 0.209727 S Ii:2:003:3 -:2 32 < > b752f480 7.241479 S Ci:3:001:0 s a3 00 0000 0001 0004 4 < > b752f480 7.241507 C Ci:3:001:0 0 4 = > 00010000 > b752f480 7.241516 S Ci:3:001:0 s a3 00 0000 0002 0004 4 < > b752f480 7.241525 C Ci:3:001:0 0 4 = > 00010100 > b752f480 7.241532 S Co:3:001:0 s 23 01 0010 0002 0000 0 > b752f480 7.241543 C Co:3:001:0 0 0 > dd776540 7.341741 S Ii:3:001:1 -:2048 4 < > dd776540 7.341768 C Ii:3:001:1 -2:2048 0 This indicates that the connection existed only for a very brief period of time (a lot less than one second) and then the device disconnected. > I also forgot to mention: unplugging the drive and plugging it back in works as > in the original problem description. So again: the first connect fails to do > anything, but the second works. This certainly sounds like a bug in the drive's USB adapter. Evidently it is programmed to behave differently the first time it is plugged in. 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
