On Fri, 17 Dec 2010 15:07:53 -0500, Thomas H. George wrote: > On Fri, Dec 17, 2010 at 08:24:01AM +0000, Camaleón wrote:
>> Even if you boot up with just the USB hard disk attached? :-? >> > Found that if I power down the computer - not just reboot - and connect > the USB drive its drive light begins to flash immediately. Then when > the computer is powered up as bios is loaded the drive is recognized at > the bnttom of the list of hard drives available for the boot sequence > and its drive light comes on steadily. The boot sequence continues > normally and when complete the USB drive can be mounted but only by > root! > > This does not solve the hot plug problem! Nope, not at all :-( > The moment the USB drive is unmounted it returns to the previous state - > flashing steadily while the "unable to enumerate USB device on port 2" > message scrolls by. > > I regularly connect my Sansa MP3/MP4 player to this same usb port and > mount it as user tom. Again there is a message "unable to enumerate USB > device on port 2" but there is no problem in continuing. Here is the > tail of dmesg: (...) Okay, it seems to be working fine. Is your USB hard disk being powered externally or it uses the USB's own voltage? >> > Tried rmmod ehci_hcd which removed the module. This did not help, >> > same result as above. >> >> "Same" message cannot be ;-) >> >> If the high speed USB module was removed, "ehci_hdc" should not be >> present in your "dmesg" log when plugging the drive (resend the log >> again, once you unload "ehci_hcd" module). > > You are correct. After rmmod ehci_hcd the tail of dmesg is > > [ 1441.408024] hub 2-0:1.0: unable to enumerate USB device on port 2 [ > 1441.816519] hub 2-0:1.0: unable to enumerate USB device on port 2 [ > 1442.240023] hub 2-0:1.0: unable to enumerate USB device on port 2 [ > 1442.824520] usb 2-2: new full speed USB device using ohci_hcd and > address 41 [ 1442.888534] hub 2-0:1.0: unable to enumerate USB device on > port 2 [ 1443.136518] hub 2-0:1.0: unable to enumerate USB device on > port 2 [ 1443.544520] hub 2-0:1.0: unable to enumerate USB device on > port 2 [ 1443.960519] hub 2-0:1.0: unable to enumerate USB device on > port 2 [ 1444.384020] hub 2-0:1.0: unable to enumerate USB device on > port 2 [ 1444.792017] hub 2-0:1.0: unable to enumerate USB device on > port 2 >> > Note these messages would scroll by rapidly as addresses 5 through 127 > would be tried repeatedly There is still one more thing I would try: completely unload and reload all of the USB modules (modprobe -r ehci_hdc; modprobe -r ohci_hdc; modprobe ehci_hdc; modprobe ohci_hdc) and then, switch on your USB drive. If none of the above helps, I would fill a bug. Greetings, -- Camaleón -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
