启动缓慢：xhci_hcd 0000:00:14.0：等待设置设备命令时超时

Question

我在全新的 18.04.4 LTS 安装中遇到启动缓慢的问题。这种缓慢的启动似乎是由于 USB 内核基础设施在尝试初始化时遇到超时造成的。

我拔掉了所有外部 USB 设备，试图找出罪魁祸首，但没有成功。唯一剩下的是内部 flirc 模块，它也连接到 USB 总线，所以这不太可能，因为它之前在 Xenial 上工作......

不幸的是我不知道如何正确解释 dmesg 输出。有人可以告诉我到底是哪个设备导致了这个问题吗？例如，哇，我应该读这一行吗usb 3-11: device descriptor read/64, error -110？

$ dmesg
[...]
[   18.840539] usb 3-11: device descriptor read/64, error -110
[   34.456541] usb 3-11: device descriptor read/64, error -110
[   34.720461] usb 3-11: new full-speed USB device number 4 using xhci_hcd
[   50.328537] usb 3-11: device descriptor read/64, error -110
[   65.944535] usb 3-11: device descriptor read/64, error -110
[   66.080494] usb usb3-port11: attempt power cycle
[   66.760460] usb 3-11: new full-speed USB device number 5 using xhci_hcd
[   71.960551] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[   72.196598] usb 3-11: Device not responding to setup address.
[   72.432460] usb 3-11: device not accepting address 5, error -71
[   72.588460] usb 3-11: new full-speed USB device number 6 using xhci_hcd
[   77.848555] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[   78.084597] usb 3-11: Device not responding to setup address.
[   78.320457] usb 3-11: device not accepting address 6, error -71
[   78.350687] usb usb3-port11: unable to enumerate USB device
[   78.383974] hidraw: raw HID events driver (C) Jiri Kosina
[   78.423149] usbcore: registered new interface driver usbhid
[   78.453215] usbhid: USB HID core driver
[   78.484704] input: flirc.tv flirc Keyboard as /devices/pci0000:00/0000:00:14.0/usb3/3-6/3-6:1.0/0003:20A0:0001.0001/input/input3
[   78.572642] input: flirc.tv flirc Consumer Control as /devices/pci0000:00/0000:00:14.0/usb3/3-6/3-6:1.0/0003:20A0:0001.0001/input/input4
[   78.604675] input: flirc.tv flirc System Control as /devices/pci0000:00/0000:00:14.0/usb3/3-6/3-6:1.0/0003:20A0:0001.0001/input/input5
[   78.636707] hid-generic 0003:20A0:0001.0001: input,hidraw0: USB HID v1.01 Keyboard [flirc.tv flirc] on usb-0000:00:14.0-6/input0
[...]

$ hwinfo 
36: USB 00.1: 0000 Unclassified device
  [Created at usb.122]
  Unique ID: zGic.dZ7C1EsCH66
  Parent ID: uIhY.2DFUsyrieMD
  SysFS ID: /devices/pci0000:00/0000:00:14.0/usb3/3-6/3-6:1.1
  SysFS BusID: 3-6:1.1
  Hardware Class: unknown
  Model: "Clay Logic flirc"
  Hotplug: USB
  Vendor: usb 0x20a0 "Clay Logic"
  Device: usb 0x0001 "flirc"
  Revision: "1.00"
  Speed: 1.5 Mbps
  Module Alias: "usb:v20A0p0001d0100dc00dsc00dp00icFFiscFFipFFin01"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #35 (Hub)
  
$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 8087:8001 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 20a0:0001 Clay Logic
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

编辑 打开我的 HTPC 机箱并拔掉 flirc 模块后，它可以正常快速启动，没有任何内核错误。所以这个 USB 设备造成了麻烦。然而我仍然不明白为什么这会突然开始，而且 Xenial 从来都没有出现过问题。如果有人能阐明这一点，我仍然会很高兴。

Answer 1

从这里的描述来看，USB错误使用我们习惯的相同的旧常规errno值，其中110表示超时（ETIMEDOUT）

Answer 2

这应该有帮助：https ://askubuntu.com/a/1239249/326048

此人给出的答案是关于诊断与 USB 硬件相关的内核问题的教育答案。