接上usb裝置的錯誤訊息

接上usb裝置時　打fdisk -l都找不到sdb

於是用dmesg　會看到下列這些錯誤訊息

usb 1-2: new full speed USB device using uhci_hcd and address 8
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 9
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 10
usb 1-2: device not accepting address 10, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 11
usb 1-2: device not accepting address 11, error -71


這個時候打rmmod ehci_hcd
再重新連接usb裝置　過一陣子就可以抓到了
打fdisk -l可以看到sdb

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我忘記我在哪裡看到的　囧.....