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Re: usb drive nolonger registers on one pc, still registers on another



On Fri, Dec 17, 2010 at 09:09:55PM +0000, Camaleón wrote:
> 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.
> 
None of this helped, I'll try to file a bug.

Tom
> 
> 
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