Re: usb drive nolonger registers on one pc, still registers on another
On Fri, Dec 17, 2010 at 08:24:01AM +0000, Camaleón wrote:
> On Thu, 16 Dec 2010 17:11:02 -0500, Thomas H. George wrote:
>
> > On Wed, Dec 15, 2010 at 02:54:54PM +0000, Camaleón wrote:
>
> >> Remove all the USB devices that are attached to the computer and just
> >> leave the USB hard disk. Are you still getting the warnings when only 1
> >> USB device is connected?
> >>
> > Yes. Disconnected USB mouse, printer, dvd-rw drive, scanner and ups.
> > Then connected the USB hard drive and again a continuous stream of
> > "unable to enumerate USB device on port 2"
>
> 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!
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:
[18334.676035] hub 1-0:1.0: unable to enumerate USB device on port 2
[19037.780019] usb 1-2: new high speed USB device using ehci_hcd and address 32
[19037.928023] hub 1-0:1.0: unable to enumerate USB device on port 2
[19040.136518] usb 1-2: new high speed USB device using ehci_hcd and address 33
[19040.270482] usb 1-2: New USB device found, idVendor=0781, idProduct=74c2
[19040.270514] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[19040.270541] usb 1-2: Product: SanDisk Sansa Fuze
[19040.270560] usb 1-2: Manufacturer: SanDisk
[19040.270577] usb 1-2: SerialNumber: DE0FF5024426B6A80000000000000000
[19040.270705] usb 1-2: configuration #1 chosen from 1 choice
[19040.273842] scsi10 : SCSI emulation for USB Mass Storage devices
[19040.273994] usb-storage: device found at 33
[19040.273996] usb-storage: waiting for device to settle before scanning
[19045.272290] usb-storage: device scan complete
[19045.274263] scsi 10:0:0:0: Direct-Access SanDisk Sansa Fuze 4GB v02. PQ: 0 ANSI: 0
[19045.274747] scsi 10:0:0:1: Direct-Access SanDisk Sansa Fuze 4GB v02. PQ: 0 ANSI: 0
[19045.275369] sd 10:0:0:0: Attached scsi generic sg5 type 0
[19045.275632] sd 10:0:0:1: Attached scsi generic sg6 type 0
[19045.276866] sd 10:0:0:0: [sdd] 7683072 512-byte logical blocks: (3.93 GB/3.66 GiB)
[19045.278530] sd 10:0:0:0: [sdd] Write Protect is off
[19045.278563] sd 10:0:0:0: [sdd] Mode Sense: 04 00 00 00
[19045.278566] sd 10:0:0:0: [sdd] Assuming drive cache: write through
[19045.283502] sd 10:0:0:1: [sde] Attached SCSI removable disk
[19045.286110] sd 10:0:0:0: [sdd] Assuming drive cache: write through
[19045.286666] sdd:
[19045.298125] sd 10:0:0:0: [sdd] Assuming drive cache: write through
[19045.298701] sd 10:0:0:0: [sdd] Attached SCSI removable disk
[19134.607371] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
> >> > I entered fdisk -l while the scrolling continued and the three sata
> >> > hard drives were detected (the response interleaved in the scrolling)
> >> > but the USB drive was not detected.
> >>
> > 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
> Also, have you tested with another high speed USB drive? If it happens
> the same it would the a bit suspicious.
As noted above there is no problem hot plugging the Sansa MP3 player as
a USB drive to create and remove directories and write and remove files.
Tom
>
>
>
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