我的笔记本电脑 (w230st clevo) 上有 3 个 USB3.0 端口和 1 个 USB2.0 端口。不幸的是，USB2.0 端口无法工作，尽管使用 进行查找时会显示该端口lsusb，如下所示。奇怪的是，它lsusb显示了 3 个 USB2.0 端口和 1 个 USB3.0 端口 - 所以可能是 Ubuntu 误解了硬件。我可以提供的另一条信息是，可启动 USB 棒也只能与 USB3.0 端口配合使用，如果将可启动 USB 棒插入 USB2.0 端口，它甚至不会显示在 bios 启动设备菜单中。
这里的输出是lsusb：
user@w230st:~$ lsusb
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 003 Device 002: ID 041e:3042 Creative Technology, Ltd
Bus 003 Device 003: ID 8087:07da Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
输出如下lspci：
user@w230st:~$ lspci
00:00.0 Host bridge: Intel Corporation Haswell DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Haswell PCI Express x16 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation Haswell Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Haswell HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation Lynx Point USB xHCI Host Controller (rev 05)
00:16.0 Communication controller: Intel Corporation Lynx Point MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation Lynx Point USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation Lynx Point High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #1 (rev d5)
00:1c.2 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #3 (rev d5)
00:1c.3 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #4 (rev d5)
00:1d.0 USB controller: Intel Corporation Lynx Point USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation Lynx Point LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation Lynx Point 6-port SATA Controller 1 [AHCI mode] (rev 05)
00:1f.3 SMBus: Intel Corporation Lynx Point SMBus Controller (rev 05)
01:00.0 3D controller: NVIDIA Corporation GK106M [GeForce GTX 765M] (rev ff)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5287 (rev 01)
04:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller (rev 12)
以及输出dmesg | grep USB
user@w230st:~$ dmesg | grep USB
[ 0.669303] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.669440] ehci-pci 0000:00:1a.0: new USB bus registered, assigned bus number 1
[ 0.683055] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00
[ 0.683107] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 0.683148] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.683398] hub 1-0:1.0: USB hub found
[ 0.683609] ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 2
[ 0.699040] ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00
[ 0.699089] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 0.699130] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.699366] hub 2-0:1.0: USB hub found
[ 0.699558] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.699607] uhci_hcd: USB Universal Host Controller Interface driver
[ 0.699723] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 3
[ 0.699961] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002
[ 0.700002] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.700239] hub 3-0:1.0: USB hub found
[ 0.704226] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 4
[ 0.704293] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003
[ 0.704331] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.706093] hub 4-0:1.0: USB hub found
[ 0.994752] usb 1-1: new high-speed USB device number 2 using ehci-pci
[ 1.127059] usb 1-1: New USB device found, idVendor=8087, idProduct=8008
[ 1.127104] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1.127395] hub 1-1:1.0: USB hub found
[ 1.238476] usb 2-1: new high-speed USB device number 2 using ehci-pci
[ 1.370775] usb 2-1: New USB device found, idVendor=8087, idProduct=8000
[ 1.370777] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1.370999] hub 2-1:1.0: USB hub found
[ 1.538132] usb 3-1: new full-speed USB device number 2 using xhci_hcd
[ 1.556454] usb 3-1: New USB device found, idVendor=041e, idProduct=3042
[ 1.556456] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1.721920] usb 3-7: new full-speed USB device number 3 using xhci_hcd
[ 1.742075] usb 3-7: New USB device found, idVendor=8087, idProduct=07da
[ 1.742077] usb 3-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1.909718] usb 3-8: new high-speed USB device number 4 using xhci_hcd
[ 1.985912] usb 3-8: New USB device found, idVendor=5986, idProduct=0400
[ 1.985914] usb 3-8: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 12.050722] USB Video Class driver (1.1.1)
[ 1202.564626] usb 3-8: USB disconnect, device number 4
目前我有点不知道如何最好地分析这个问题。我想知道这是硬件问题还是 Ubuntu 问题。
dmesg | tail这是将 USB 驱动器插入 2.0 端口后立即的输出：
user@w230st:~$ dmesg | tail
[ 266.418505] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 266.501513] pci 0000:01:00.0: power state changed by ACPI to D3cold
[ 266.505492] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 2 ep 2 with no TDs queued?
[ 266.505498] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 2 ep 0 with no TDs queued?
[ 269.579117] net_ratelimit: 135 callbacks suppressed
[ 269.579133] r8169 0000:04:00.1 eth0: link up
[ 269.579148] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 278.254899] hid-generic 0005:045E:0700.0002: unknown main item tag 0x0
[ 278.254953] input: Microsoft Bluetooth Notebook Mouse 5000 as /devices/pci0000:00/0000:00:14.0/usb3/3-7/3-7:1.0/bluetooth/hci0/hci0:34/input15
[ 278.255105] hid-generic 0005:045E:0700.0002: input,hidraw0: BLUETOOTH HID v1.00 Mouse [Microsoft Bluetooth Notebook Mouse 5000] on b4:b6:76:94:7c:bb
请注意，我没有插入与鼠标相关的蓝牙 USB 棒，它直接连接到笔记本电脑的蓝牙。
全部编号： usb找到的设备sudo lshw：
*-usb:0
description: USB controller
product: Lynx Point USB xHCI Host Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 05
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:41 memory:f7a00000-f7a0ffff
*-usb:1
description: USB controller
product: Lynx Point USB Enhanced Host Controller #2
vendor: Intel Corporation
physical id: 1a
bus info: pci@0000:00:1a.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: pm debug ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:16 memory:f7a1c000-f7a1c3ff
*-usb:2
description: USB controller
product: Lynx Point USB Enhanced Host Controller #1
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: 05
width: 32 bits
clock: 33MHz
capabilities: pm debug ehci bus_master cap_list
configuration: driver=ehci-pci latency=0
resources: irq:23 memory:f7a1b000-f7a1b3ff