Sometimes Ubuntu doesn't connect to my external USB drive

[NoOp]

On 07/14/2011 04:59 PM, Johnny Rosenberg wrote:
...
> Jul 15 01:56:30 EasyNote-MX66 kernel: [56274.949093] usb 1-2: new high
> speed USB device using ehci_hcd and address 89
> Jul 15 01:56:30 EasyNote-MX66 kernel: [56275.052409] hub 1-0:1.0:
> unable to enumerate USB device on port 2
> 
> So it seems like it's at least trying, but failing for some reason…
...
After a little googling, most of the 'unable to enumerate' errors seem
to come from hardware issues (low power/dirty usb ports). Just for the
heck of it, can you move it to another usb port, preferably a back usb
port if it is on a desktop? Reason for asking is that usb ports on the
front of a desktop typically are wired extensions of the motherboard usb
ports (the ones that are connected to the back) & can pick up rf
interference and experience low power. Might also be a faulty cable.
You could check the power:
http://pinouts.ru/Slots/USB_pinout.shtml

Also, in one bug report several users seemed to resolve by cleaning the
usb contacts. Shot in the dark, but worth trying.

Other possibilities:

1. Is your bios up to date? Older versions of bios may have difficulty
with newer high speed usb 2.0 devices.

2. If you think you can rule out hardware/cables/power/RFinterference,
then you might try backing down to an older kernel, or trying a newer
kernel to see if there is any change. Also try searching:
<https://launchpad.net/+search?field.text=unable+to+enumerate+USB+device+on+port>