[Bug 349767] Re: external USB hard drive disconnects

[the]

Have the same issue with Lucid  on Lenovo Thinkpad W500 with external
Hitachi HTS72101 0G9SA00 hard drive when copying data from the external
drive to local hard drive and vice versa.

Kernel 2.6.32-22-generic-pae
Description:	Ubuntu 10.04 LTS
Release:	10.04
Codename:	lucid

This issue highly depends on the hardware combination.
1. other external hard drives like Lenovo secure hard disk 160GB do not show this issue
2. same Hitachi HDD attached to a Lenovo Thinkpad T61p does not have this issue.

/var/log/messages entries when copying fails:
May 11 16:33:20 user-laptop kernel: [ 5060.404169] usb 1-1: USB disconnect, address 5
May 11 16:33:20 user-laptop kernel: [ 5060.404227] sd 7:0:0:0: [sdc] Unhandled error code
May 11 16:33:20 user-laptop kernel: [ 5060.404234] sd 7:0:0:0: [sdc] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
May 11 16:33:20 user-laptop kernel: [ 5060.404244] sd 7:0:0:0: [sdc] CDB: Read(10): 28 00 01 3c 23 df 00 00 f0 00
May 11 16:33:20 user-laptop kernel: [ 5060.404334] sd 7:0:0:0: [sdc] Unhandled error code
May 11 16:33:20 user-laptop kernel: [ 5060.404340] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
May 11 16:33:20 user-laptop kernel: [ 5060.404348] sd 7:0:0:0: [sdc] CDB: Read(10): 28 00 01 3c 24 cf 00 00 10 00
May 11 16:33:20 user-laptop kernel: [ 5060.404394] sd 7:0:0:0: [sdc] Unhandled error code
May 11 16:33:20 user-laptop kernel: [ 5060.404399] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
May 11 16:33:20 user-laptop kernel: [ 5060.404407] sd 7:0:0:0: [sdc] CDB: Read(10): 28 00 01 3c 24 df 00 00 f0 00
May 11 16:33:20 user-laptop kernel: [ 5060.604527] usb 3-1: new full speed USB device using uhci_hcd and address 10
May 11 16:33:21 user-laptop kernel: [ 5061.164236] usb 3-1: new full speed USB device using uhci_hcd and address 11
May 11 16:33:21 user-laptop kernel: [ 5061.724045] usb 3-1: new full speed USB device using uhci_hcd and address 12
May 11 16:33:22 user-laptop kernel: [ 5062.244102] usb 3-1: new full speed USB device using uhci_hcd and address 13

The partition /dev/sdc1 is now "unmounted" and the complete drive is
unavailable.

Kind regards,
Thorsten

** Attachment added: "lshw -html output, red devices are unclaimed=not managed by a module - external drive is /dev/sdc"
   http://launchpadlibrarian.net/48277152/W500_hardware.html

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external USB hard drive disconnects
https://bugs.launchpad.net/bugs/349767
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