This issue still not fixed in Ubuntu 12.04. I marked bug #292522, bug #384299, bug #407746 as duplicates to this bug.

Also exist related bug #263217, I not touched it, as it in "Fix Released" state.

Here syslog output on attaching device in usb storage mode:

May 23 19:21:54 eugene-desktop kernel: [31513.828082] usb 2-10: new full-speed USB device number 15 using ohci_hcd
May 23 19:21:54 eugene-desktop mtp-probe: checking bus 2, device 15: "/sys/devices/pci0000:00/0000:00:02.0/usb2/2-10"
May 23 19:21:54 eugene-desktop mtp-probe: bus: 2, device: 15 was not an MTP device
May 23 19:21:54 eugene-desktop kernel: [31514.052247] Initializing USB Mass Storage driver...
May 23 19:21:54 eugene-desktop kernel: [31514.058008] scsi11 : usb-storage 2-10:1.0
May 23 19:21:54 eugene-desktop kernel: [31514.058109] usbcore: registered new interface driver usb-storage
May 23 19:21:54 eugene-desktop kernel: [31514.058111] USB Mass Storage support registered.
May 23 19:21:54 eugene-desktop usb_modeswitch[32014]: usb_modeswitch: switching disabled, no action for 05c6:1000
May 23 19:21:55 eugene-desktop kernel: [31515.065062] scsi 11:0:0:0: Direct-Access     Samsung  Mass Storage     2.31 PQ: 0 ANSI: 2
May 23 19:21:55 eugene-desktop kernel: [31515.066826] sd 11:0:0:0: Attached scsi generic sg3 type 0
May 23 19:21:55 eugene-desktop kernel: [31515.087053] sd 11:0:0:0: [sdc] 122625 512-byte logical blocks: (62.7 MB/59.8 MiB)
May 23 19:21:55 eugene-desktop kernel: [31515.094038] sd 11:0:0:0: [sdc] Write Protect is off
May 23 19:21:55 eugene-desktop kernel: [31515.094049] sd 11:0:0:0: [sdc] Mode Sense: 0b 00 00 08
May 23 19:21:55 eugene-desktop kernel: [31515.101087] sd 11:0:0:0: [sdc] No Caching mode page present
May 23 19:21:55 eugene-desktop kernel: [31515.101101] sd 11:0:0:0: [sdc] Assuming drive cache: write through
May 23 19:21:55 eugene-desktop kernel: [31515.134042] sd 11:0:0:0: [sdc] No Caching mode page present
May 23 19:21:55 eugene-desktop kernel: [31515.134053] sd 11:0:0:0: [sdc] Assuming drive cache: write through
May 23 19:21:55 eugene-desktop kernel: [31515.159074]  sdc: sdc1
May 23 19:21:55 eugene-desktop kernel: [31515.200052] sd 11:0:0:0: [sdc] No Caching mode page present
May 23 19:21:55 eugene-desktop kernel: [31515.200063] sd 11:0:0:0: [sdc] Assuming drive cache: write through
May 23 19:21:55 eugene-desktop kernel: [31515.200071] sd 11:0:0:0: [sdc] Attached SCSI removable disk
May 23 19:21:55 eugene-desktop kernel: [31515.269992] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.270001] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.270012] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.270023] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.270034] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 df 00 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.270055] end_request: I/O error, dev sdc, sector 122624
May 23 19:21:55 eugene-desktop kernel: [31515.270064] quiet_error: 365 callbacks suppressed
May 23 19:21:55 eugene-desktop kernel: [31515.270071] Buffer I/O error on device sdc, logical block 122624
May 23 19:21:55 eugene-desktop kernel: [31515.286988] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.286997] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.287007] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.287018] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.287029] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 df 00 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.287050] end_request: I/O error, dev sdc, sector 122624
May 23 19:21:55 eugene-desktop kernel: [31515.287060] Buffer I/O error on device sdc, logical block 122624
May 23 19:21:55 eugene-desktop kernel: [31515.303996] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.304035] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.304045] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.304069] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.304090] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de f8 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.304152] end_request: I/O error, dev sdc, sector 122616
May 23 19:21:55 eugene-desktop kernel: [31515.304166] Buffer I/O error on device sdc, logical block 122616
May 23 19:21:55 eugene-desktop kernel: [31515.304178] Buffer I/O error on device sdc, logical block 122617
May 23 19:21:55 eugene-desktop kernel: [31515.304188] Buffer I/O error on device sdc, logical block 122618
May 23 19:21:55 eugene-desktop kernel: [31515.304198] Buffer I/O error on device sdc, logical block 122619
May 23 19:21:55 eugene-desktop kernel: [31515.304208] Buffer I/O error on device sdc, logical block 122620
May 23 19:21:55 eugene-desktop kernel: [31515.304219] Buffer I/O error on device sdc, logical block 122621
May 23 19:21:55 eugene-desktop kernel: [31515.304230] Buffer I/O error on device sdc, logical block 122622
May 23 19:21:55 eugene-desktop kernel: [31515.304240] Buffer I/O error on device sdc, logical block 122623
May 23 19:21:55 eugene-desktop kernel: [31515.320998] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.321007] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.321017] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.321028] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.321039] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de f8 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.321059] end_request: I/O error, dev sdc, sector 122616
May 23 19:21:55 eugene-desktop kernel: [31515.337994] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.338003] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.338013] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.338023] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.338033] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de f9 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.338053] end_request: I/O error, dev sdc, sector 122617
May 23 19:21:55 eugene-desktop kernel: [31515.354967] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.354970] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.354973] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.354976] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.354980] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de fa 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.354986] end_request: I/O error, dev sdc, sector 122618
May 23 19:21:55 eugene-desktop kernel: [31515.371960] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.371964] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.371966] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.371970] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.371973] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 df 00 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.371979] end_request: I/O error, dev sdc, sector 122624
May 23 19:21:55 eugene-desktop kernel: [31515.388971] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:55 eugene-desktop kernel: [31515.388976] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:55 eugene-desktop kernel: [31515.388980] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:55 eugene-desktop kernel: [31515.388985] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:55 eugene-desktop kernel: [31515.388990] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 df 00 00 00 01 00
May 23 19:21:55 eugene-desktop kernel: [31515.389000] end_request: I/O error, dev sdc, sector 122624
May 23 19:21:56 eugene-desktop kernel: [31515.406027] sd 11:0:0:0: [sdc] Unhandled sense code
May 23 19:21:56 eugene-desktop kernel: [31515.406037] sd 11:0:0:0: [sdc]  Result: hostbyte=invalid driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.406047] sd 11:0:0:0: [sdc]  Sense Key : Medium Error [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.406058] sd 11:0:0:0: [sdc]  Add. Sense: Recorded entity not found
May 23 19:21:56 eugene-desktop kernel: [31515.406068] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 df 00 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.406089] end_request: critical target error, dev sdc, sector 122624
May 23 19:21:56 eugene-desktop kernel: [31515.423001] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.423011] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.423020] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.423029] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.423040] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de f8 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.423061] end_request: I/O error, dev sdc, sector 122616
May 23 19:21:56 eugene-desktop kernel: [31515.439969] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.439972] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.439975] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.439978] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.439982] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de f9 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.439988] end_request: I/O error, dev sdc, sector 122617
May 23 19:21:56 eugene-desktop kernel: [31515.456979] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.456982] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.456985] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.456988] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.456992] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de fa 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.456998] end_request: I/O error, dev sdc, sector 122618
May 23 19:21:56 eugene-desktop kernel: [31515.473958] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.473962] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.473965] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.473968] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.473971] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de c0 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.473978] end_request: I/O error, dev sdc, sector 122560
May 23 19:21:56 eugene-desktop kernel: [31515.491000] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.491010] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.491019] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.491030] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.491042] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de c1 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.491063] end_request: I/O error, dev sdc, sector 122561
May 23 19:21:56 eugene-desktop kernel: [31515.507994] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.508031] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.508042] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.508053] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.508075] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 de c2 00 00 06 00
May 23 19:21:56 eugene-desktop kernel: [31515.508145] end_request: I/O error, dev sdc, sector 122562
May 23 19:21:56 eugene-desktop kernel: [31515.524960] sd 11:0:0:0: [sdc] Device not ready
May 23 19:21:56 eugene-desktop kernel: [31515.524963] sd 11:0:0:0: [sdc]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
May 23 19:21:56 eugene-desktop kernel: [31515.524966] sd 11:0:0:0: [sdc]  Sense Key : Not Ready [current] 
May 23 19:21:56 eugene-desktop kernel: [31515.524969] sd 11:0:0:0: [sdc]  Add. Sense: Medium not present
May 23 19:21:56 eugene-desktop kernel: [31515.524973] sd 11:0:0:0: [sdc] CDB: Read(10): 28 00 00 01 df 00 00 00 01 00
May 23 19:21:56 eugene-desktop kernel: [31515.524979] end_request: I/O error, dev sdc, sector 122624