USB集线器坏了。lsusb、-v和dmesg对于它是自助式的还是总线驱动的，意见不一。

Question

我正在尝试使用在戴尔7490笔记本上运行Ubuntu22.10的Sabrent HB-BU10。

由于没有插入USB，系统用lsusb -v报告了以下内部集线器：

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

由于只有电源集线器(没有连接的设备)插入了系统，lsusb -v报告了两个新的集线器(显然是USB2和USB3都是枚举的)。我从长清单中插入了几行代码：

Bus 002 Device 029: ID 0bda:0411 Realtek Semiconductor Corp. Hub  (2)
      iProduct                2 USB3.2 Hub
      bmAttributes         0xe0
      Self Powered
      MaxPower                0mA
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub (105)  Native
Bus 001 Device 030: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub  (1017)
      iProduct                2 USB2.1 Hub
      MaxPower                0mA
      bmAttributes         0xe0
      Self Powered
      Remote Wakeup
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  (1390)  Native

集线器被正确地识别为“自动供电”，因为它有一个提供60W的外部电源。

但是，当仅将集线器(没有设备)插入计算机上的任何USB端口时，可以看到：

$ sudo dmesg
[51415.379442] usb 1-2: new high-speed USB device number 33 using xhci_hcd
[51415.543357] usb 1-2: New USB device found, idVendor=0bda, idProduct=5411, bcdDevice= 0.02
[51415.543370] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[51415.543377] usb 1-2: Product: USB2.1 Hub
[51415.543381] usb 1-2: Manufacturer: Generic
[51415.547300] hub 1-2:1.0: USB hub found
[51415.548519] hub 1-2:1.0: 4 ports detected
[51415.663869] usb 2-3: new SuperSpeed USB device number 32 using xhci_hcd
[51415.699153] usb 2-3: New USB device found, idVendor=0bda, idProduct=0411, bcdDevice= 0.02
[51415.699157] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[51415.699159] usb 2-3: Product: USB3.2 Hub
[51415.699160] usb 2-3: Manufacturer: Generic
[51415.706866] hub 2-3:1.0: USB hub found
[51415.708501] hub 2-3:1.0: 4 ports detected
[51415.847274] usb 1-2.4: new high-speed USB device number 34 using xhci_hcd
[51415.959902] usb 1-2.4: can't connect bus-powered hub to this port
[51416.045174] usb 2-3.4: new SuperSpeed USB device number 33 using xhci_hcd
[51416.071928] usb 2-3.4: can't connect bus-powered hub to this port

此外，如果将任何设备插入集线器，则还会记录此消息：

usb 2-3.2: rejected 1 configuration due to insufficient available bus power

为什么系统认为集线器是有功率限制的总线供电的，而实际上它是自助式的，并且在lsusb中正确识别？

Answer 1

答案是枢纽有缺陷。目前还不清楚具体的单位是有缺陷的，还是设计的。

在搜索和研究了几个小时的USB子系统后，我一无所获。当我得出结论说，当集线器自动供电时，它是以公共汽车为动力的，于是我就去买了一个新的集线器。我从范泰克中找到了一个具有类似功能的。

效果很好。在dmesg中没有报告错误：

[59222.814154] usb 2-4.1.1: Product: USB3.0 Hub
[59222.814155] usb 2-4.1.1: Manufacturer: VIA Labs, Inc.
[59222.814157] usb 2-4.1.1: SerialNumber: 000000000
[59222.816135] hub 2-4.1.1:1.0: USB hub found
[59222.816286] hub 2-4.1.1:1.0: 4 ports detected