проблемы с usb

доброго времени суток,
не видяться usb устройства, причем если их подключать ДО того как влючают компьютер все работает, а при подключенни после заргрузки возникают проблемы:

при вставлке usb хаба:

# dmesg 
....
eth1: link up, 100Mbps, full-duplex, lpa 0x41E1
usb 2-6: new high speed USB device using ehci_hcd and address 8
usb 2-6: device descriptor read/64, error -71
usb 2-6: device descriptor read/64, error -71
usb 2-6: new high speed USB device using ehci_hcd and address 9
usb 2-6: new high speed USB device using ehci_hcd and address 10
usb 2-6: new high speed USB device using ehci_hcd and address 11
usb 2-6: device descriptor read/64, error -71
usb 2-6: device descriptor read/64, error -71
usb 2-6: new high speed USB device using ehci_hcd and address 12
usb 2-6: device descriptor read/64, error -71
usb 2-6: device descriptor read/64, error -71
usb 2-6: new high speed USB device using ehci_hcd and address 13
usb 2-6: device not accepting address 13, error -71
usb 2-6: new high speed USB device using ehci_hcd and address 15
usb 2-6: device descriptor read/64, error -71
usb 2-6: device descriptor read/64, error -71
usb 2-6: new high speed USB device using ehci_hcd and address 16
usb 2-6: device descriptor read/64, error -71


при вставке mp3 плеера

# dmesg

scsi5 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 46
usb-storage: waiting for device to settle before scanning
usb 2-6: USB disconnect, address 46
usb 2-6: new high speed USB device using ehci_hcd and address 47
usb 2-6: configuration #1 chosen from 1 choice
scsi6 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 47
usb-storage: waiting for device to settle before scanning
  Vendor: Generic   Model: USB Flash Disk    Rev: 7.76
  Type:   Direct-Access                      ANSI SCSI revision: 02
SCSI device sdb: 1 512-byte hdwr sectors (0 MB)
sdb: Write Protect is off
sdb: Mode Sense: 03 00 00 00
sdb: assuming drive cache: write through
SCSI device sdb: 1 512-byte hdwr sectors (0 MB)
sdb: Write Protect is off
sdb: Mode Sense: 03 00 00 00
sdb: assuming drive cache: write through
 sdb:end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0
end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0
 unable to read partition table
sd 6:0:0:0: Attached scsi removable disk sdb
usb-storage: device scan complete
end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0
end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0

root@blackICE:/usr/src/linux# fdisk /dev/sdb 
       
Unable to read /dev/sdb
root@blackICE:/usr/src/linux#     


в чем может быть проблема ?

нашел кучу похожих ощибок в гугле, но не на одной ссылке решение этой проблемы (

(ядро ванильное - 2.6.18-5, все необходимые модули загружены)