Dapper: Lese-/Schreibzugriff auf USB-Platte bricht plötzlich ab - USB-Hub tot

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Hallo Liste,

Seit dem ich Dapper verwende bricht nach einigen Lese-/Schreibzugriff
Minuten der Kontakt zu meinen USB-Platten ab. Anfänglich nur
gelegentlich der Fall steigt die Frequenz in den letzten Tagen
sprunghaft an. Die USB-Maus läuft übrigens weiter, nur Hub und Platte
sind tot und lassen sich auch durch mehrfaches ein- und ausstecken nicht
wieder aktivieren. Ein Log des Vorgangs folgt unten.

Hardwareprobleme kann ich weitgehend ausschließen:
- dieselben Platten funktionieren unter IEEE 1394 einwandfrei
- der Fehler tritt filesystemunabhängig auf: Xfs und Ext3
- Kabelprobleme scheiden aus, da dieselbe hardware-Konfiguration mit
Knoppix läuft

Hardware-Konfiguration: 
IBM-Think-Pad mit 2 USB-Ports, daran USB-4-Port hub + Maus

Kernel: 2.6.15-23-386, 2.6.15-26-386 und 2.6.15-26-686

Jede Deutung des Logs bzw. Idee wo man zu Debuggen ansetzen könnte, wird
begrüßt. Hal? Das Kernel? Gnome-volume-manager? Pmount?
Dank und Gruß

Simon

Log: (dmesg)
#hier wird die Platte eingebunden
4294793.723000] usb 4-4.1: new high speed USB device using ehci_hcd and
address 6
[4294793.809000] scsi1 : SCSI emulation for USB Mass Storage devices
[4294793.809000] usb-storage: device found at 6
[4294793.809000] usb-storage: waiting for device to settle before
scanning
[4294799.016000]   Vendor: Maxtor    Model: OneTouch          Rev: 0200
[4294799.016000]   Type:   Direct-Access                      ANSI SCSI
revision: 00
[4294799.016000]  1:0:0:0: Attached scsi generic sg1 type 0
[4294799.023000] usb-storage: device scan complete
[4294799.548000] Driver 'sd' needs updating - please use bus_type
methods
[4294799.566000] SCSI device sda: 398295040 512-byte hdwr sectors
(203927 MB)
[4294799.567000] sda: assuming drive cache: write through
[4294799.577000] SCSI device sda: 398295040 512-byte hdwr sectors
(203927 MB)
[4294799.578000] sda: assuming drive cache: write through
[4294799.578000]  sda: sda1
[4294799.664000] sd 1:0:0:0: Attached scsi disk sda
[4294800.153000] kjournald starting.  Commit interval 5 seconds
[4294800.154000] EXT3 FS on sda1, internal journal
[4294800.154000] EXT3-fs: mounted filesystem with ordered data mode.
#so weit OK, jetzt kommt die erste Fehlermedlung:
[4295012.959000] hub 4-4:1.0: cannot reset port 1 (err = -71)
#ibidem
[4295012.960000] hub 4-4:1.0: Cannot enable port 1.  Maybe the USB cable
is bad?
[4295012.960000] hub 4-4:1.0: cannot disable port 1 (err = -71)
#Meldung 4 mal wiederholt, dann:
[4295012.965000] hub 4-4:1.0: hub_port_status failed (err = -71)
[4295012.966000] sd 1:0:0:0: SCSI error: return code = 0x70000
[4295012.966000] end_request: I/O error, dev sda, sector 28292455
#Wiederholt mit einer Reihe weiterer Sektoren, dann:
[4295013.113000] usb 4-4: USB disconnect, address 3
[4295013.113000] usb 4-4.1: USB disconnect, address 6
[4295013.117000] sd 1:0:0:0: rejecting I/O to device being removed
[4295013.117000] sd 1:0:0:0: rejecting I/O to device being removed
[4295013.117000] Buffer I/O error on device sda1, logical block 678
[4295013.117000] lost page write due to I/O error on sda1
[4295013.117000] Aborting journal on device sda1.
[4295013.117000] journal commit I/O error
[4295013.117000] sd 1:0:0:0: rejecting I/O to device being removed
[4295013.117000] Buffer I/O error on device sda1, logical block 3506178
[4295013.117000] lost page write due to I/O error on sda1
[4295013.135000] usb 4-4.3: USB disconnect, address 4
[4295013.137000] usb 4-4.4: USB disconnect, address 5
[4295013.190000]  1:0:0:0: rejecting I/O to dead device
#usw.
[4295013.775000] EXT3-fs error (device sda1): ext3_find_entry: reading
directory #2 offset 0
[4295013.775000]  1:0:0:0: rejecting I/O to dead device
[4295013.775000] Buffer I/O error on device sda1, logical block 0
[4295013.775000] lost page write due to I/O error on sda1
[4295014.757000]  1:0:0:0: rejecting I/O to dead device
#usw.
[4295014.759000] EXT3-fs error (device sda1): ext3_find_entry: reading
directory #15500120 offset 0
[4295014.759000]  1:0:0:0: rejecting I/O to dead device
[4295014.759000] Buffer I/O error on device sda1, logical block 0
[4295014.759000] lost page write due to I/O error on sda1
[4295014.780000] ext3_abort called.
[4295014.780000] EXT3-fs error (device sda1): ext3_journal_start_sb:
Detected aborted journal
[4295014.780000] Remounting filesystem read-only
[4295015.819000] usb 4-4: new high speed USB device using ehci_hcd and
address 17
[4295022.069000] usb 4-4: new high speed USB device using ehci_hcd and
address 41
[4295027.176000]  1:0:0:0: rejecting I/O to dead device
[4295027.176000] Buffer I/O error on device sda1, logical block 532
[4295027.176000] lost page write due to I/O error on sda1
[4295030.569000] usb 4-4: new high speed USB device using ehci_hcd and
address 74
[4295034.069000] usb 4-4: new high speed USB device using ehci_hcd and
address 87
[4295034.321000] ehci_hcd 0000:00:1d.7: port 4 reset error -110
[4295034.322000] hub 4-0:1.0: hub_port_status failed (err = -32)