Unitek的USB3.0 TF卡读卡器

淘宝买了个Unitek的usb3.0读卡器, 用来换掉之前用了很久sks的sub2读卡器, 收到之后在Ubuntu下先测了一下, 发现识别出来的是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

换另一个USB口, 状态依旧. 一般来讲, 显示2.1表示一个3.0设备用在了2.0的口上, 问题是这个机器的USB口是3.0的呀.

试试接在了Unitek的USB3.0 hub上, 奇怪的是这样就能识别到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

.

可能是什么原因? 等有机会切换到win7下再试试