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#1 2019-10-09 02:01:29

sim
Member
Registered: 2019-09-26
Posts: 1

USB 3.1 Gen 2 detect as USB3.0

I'm using Archlinux on my laptop (Lenovo T480s) for 1 years. It works very well.
Recently I bought an external NVME enclosure, which support USB 3.1 Gen 2(10Gbps). But I found that my Thunderbolt 3 port (compatible with USB 3.1 Gen 2) detected as USB3.0 (5000M).
Kernel:

$uname -a
Linux Laptop 5.3.5-arch1-1-ARCH #1 SMP PREEMPT Mon Oct 7 19:03:08 UTC 2019 x86_64 GNU/Linux 

USB info:

$lsusb -t
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
    |__ Port 3: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
    |__ Port 8: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 8: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M

Bus 04.Port 1 is the USB 3.0 root_hub, which the Thunderbolt 3 port connected.

# lsusb -s 04:01 -vvv 
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         3 
  bMaxPacketSize0         9
  idVendor           0x1d6b Linux Foundation
  idProduct          0x0003 3.0 root hub
  bcdDevice            5.03
  iManufacturer           3 Linux 5.3.5-arch1-1-ARCH xhci-hcd
  iProduct                2 xHCI Host Controller
  iSerial                 1 0000:3c:00.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x001f
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
        bMaxBurst               0
Hub Descriptor:
  bLength              12
  bDescriptorType      42
  nNbrPorts             2
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
  bPwrOn2PwrGood       10 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  bHubDecLat          0.0 micro seconds
  wHubDelay             0 nano seconds
  DeviceRemovable    0x00
 Hub Port Status:
   Port 1: 0000.02a0 5Gbps power Rx.Detect
   Port 2: 0000.02a0 5Gbps power Rx.Detect
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x002b
  bNumDeviceCaps          2
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x02
      Latency Tolerance Messages (LTM) Supported
    wSpeedsSupported   0x0008
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   3
      Lowest fully-functional device speed is SuperSpeed (5Gbps)
    bU1DevExitLat          10 micro seconds
    bU2DevExitLat         512 micro seconds
  SuperSpeedPlus USB Device Capability:
    bLength                28
    bDescriptorType        16
    bDevCapabilityType     10
    bmAttributes         0x00000023
      Sublink Speed Attribute count 3
      Sublink Speed ID count 1
    wFunctionalitySupport   0x0001
    bmSublinkSpeedAttr[0]   0x00050034
      Speed Attribute ID: 4 5Gb/s Symmetric RX SuperSpeed
    bmSublinkSpeedAttr[1]   0x000500b4
      Speed Attribute ID: 4 5Gb/s Symmetric TX SuperSpeed
    bmSublinkSpeedAttr[2]   0x000a4035
      Speed Attribute ID: 5 10Gb/s Symmetric RX SuperSpeedPlus
    bmSublinkSpeedAttr[3]   0x000a40b5
      Speed Attribute ID: 5 10Gb/s Symmetric TX SuperSpeedPlus
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered

I tested it on a Arch LiveCD(Kernel 4.19)
And the port detected correctly like this:

Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M 

Does anyone have the same bug?

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