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mFat
Asked: 2024-11-11 21:03:00 +0800 CST

TP-Link Archer T4U limited to USB 2 speed

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Archer T4u supports USB 3 according to official documentation but when I connect it to a USB 3 Port it is detected as a USB 2 device (as per lsusb output). I tried this on both my Ubuntu PC and laptop running Fedora 40 which both have newer USB 3.1 ports. The device works without installing any driver.

wireless

1 Answers

  1. Best Answer

    Fixed by installing the driver from: https://github.com/morrownr/88x2bu-20210702

    During the installation the script allows editing driver options.

    Setting rtw_switch_usb_mode=1 in /etc/modprobe.d/88x2bu.conf allows the device to connect in USB 3 mode.

    Output of lsusb -t:

    lsusb -t
/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=ehci-pci/6p, 480M
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=ehci-pci/6p, 480M
    |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/6p, 480M
        |__ Port 002: Dev 003, If 0, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 002: Dev 003, If 1, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 004: Dev 004, If 0, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 004: Dev 004, If 1, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 004: Dev 004, If 2, Class=Audio, Driver=snd-usb-audio, 12M
        |__ Port 004: Dev 004, If 3, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 005: Dev 005, If 0, Class=Video, Driver=uvcvideo, 480M
        |__ Port 005: Dev 005, If 1, Class=Video, Driver=uvcvideo, 480M
        |__ Port 005: Dev 005, If 2, Class=Vendor Specific Class, Driver=[none], 480M
        |__ Port 006: Dev 006, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 003.Port 001: Dev 001, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 004.Port 001: Dev 001, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 005.Port 001: Dev 001, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/3p, 12M
        |__ Port 001: Dev 003, If 0, Class=Vendor Specific Class, Driver=btusb, 12M
        |__ Port 001: Dev 003, If 1, Class=Wireless, Driver=btusb, 12M
        |__ Port 001: Dev 003, If 2, Class=Vendor Specific Class, Driver=btusb, 12M
        |__ Port 001: Dev 003, If 3, Class=Application Specific Interface, Driver=[none], 12M
/:  Bus 006.Port 001: Dev 001, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 007.Port 001: Dev 001, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 008.Port 001: Dev 001, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 009.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/2p, 480M
    |__ Port 002: Dev 002, If 0, Class=Hub, Driver=hub/4p, 480M
/:  Bus 010.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/2p, 10000M
    |__ Port 002: Dev 002, If 0, Class=Hub, Driver=hub/4p, 5000M
        |__ Port 001: Dev 004, If 0, Class=Vendor Specific Class, Driver=rtl88x2bu, 5000M

    Here is the detailed output of lsusb for the device:

    sudo lsusb -D /dev/bus/usb/010/004
Device: ID 2357:0115 TP-Link Archer T4U ver.3
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0 [unknown]
  bDeviceSubClass         0 [unknown]
  bDeviceProtocol         0 
  bMaxPacketSize0         9
  idVendor           0x2357 TP-Link
  idProduct          0x0115 Archer T4U ver.3
  bcdDevice            3.00
  iManufacturer           1 Realtek
  iProduct                2 802.11ac NIC
  iSerial                 3 123456
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0053
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              504mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           5
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              2 802.11ac NIC
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x06  EP 6 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x87  EP 7 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               3
        bMaxBurst               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x08  EP 8 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x0016
  bNumDeviceCaps          2
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000002
      HIRD Link Power Management (LPM) Supported
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat          10 micro seconds
    bU2DevExitLat         287 micro seconds
Device Status:     0x0000
  (Bus Powered)

    hardinfo2 output:

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