Unitek的USB3.0 TF卡讀卡器

淘寶買了個Unitek的usb3.0讀卡器, 用來換掉以前用了好久sks的sub2讀卡器, 收到以後在Ubuntu下先測了一下, 發現識別出來的是usb2.1

lsusb -D /dev/bus/usb/002/007
Device: ID 05e3:0749 Genesys Logic, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x05e3 Genesys Logic, Inc.
  idProduct          0x0749 
  bcdDevice           15.32
  iManufacturer           3 Generic
  iProduct                4 USB3.0 Card Reader
  iSerial                 2 000000001532

換另外一個USB口, 狀態依舊. 通常來說, 顯示2.1表示一個3.0設備用在了2.0的口上, 問題是這個機器的USB口是3.0的呀.

試試接在了Unitek的USB3.0 hub上, 奇怪的是這樣就能識別到3.0了

lsusb -D /dev/bus/usb/003/003
Device: ID 05e3:0749 Genesys Logic, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         9
  idVendor           0x05e3 Genesys Logic, Inc.
  idProduct          0x0749 
  bcdDevice           15.32
  iManufacturer           3 Generic
  iProduct                4 USB3.0 Card Reader
  iSerial                 2 000000001532

.

多是什麼緣由? 等有機會切換到win7下再試試