Re: usb drive nolonger registers on one pc, still registers on another
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
Reply to:
- References:
- usb drive nolonger registers on one pc, still registers on another
- From: "Thomas H. George" <lists@tomgeorge.info>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: Camaleón <noelamac@gmail.com>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: "Thomas H. George" <lists@tomgeorge.info>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: "Thomas H. George" <lists@tomgeorge.info>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: Camaleón <noelamac@gmail.com>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: "Thomas H. George" <lists@tomgeorge.info>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: Camaleón <noelamac@gmail.com>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: "Thomas H. George" <lists@tomgeorge.info>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: Camaleón <noelamac@gmail.com>
- Re: usb drive nolonger registers on one pc, still registers on another
- From: "Thomas H. George" <lists@tomgeorge.info>