因此，我有以下设置 - Alienware m15 R3 配备两个 Dell U2719DC 显示器（第一个显示器通过显示端口/MST 为另一个显示器供电），通过 USB-C/Thunderbolt 3 端口连接。第一个显示器（为另一个显示器供电并通过 USB-C 连接到笔记本电脑）有两个设备连接到内置的 USB 集线器 - 一个键盘和一个鼠标。发生了什么事，在随机时间（或由于触发？）显示器开始关闭，如果我重新插入它们，它们会在几秒钟内关闭，甚至根本不会出现。我注意到该过程有时在启动 Android 模拟器时启动（启动严重的开/关循环），lspci/lswh触发单个开/关循环，有时在随机点。我尝试tail -f /var/log/{messages,kernel,dmesg,syslog}在这种开/关疯狂期间收集日志。我一直看到（很多这样的）：
Feb 3 20:11:27 rudolfs-Alienware-m15-R3 kernel: [ 5918.379945] pcieport 0000:00:1b.0: Intel SPT PCH root port ACS workaround enabled
Feb 3 20:11:28 rudolfs-Alienware-m15-R3 kernel: [ 5919.648785] usb usb3: root hub lost power or was reset
Feb 3 20:11:28 rudolfs-Alienware-m15-R3 kernel: [ 5919.648790] usb usb4: root hub lost power or was reset
其中一些（约 70%）之后我收到有关 USB 设备断开连接的通知：
Feb 3 20:12:24 rudolfs-Alienware-m15-R3 kernel: [ 5975.820361] usb 1-11: USB disconnect, device number 10
Feb 3 20:12:24 rudolfs-Alienware-m15-R3 kernel: [ 5975.820362] usb 1-11.1: USB disconnect, device number 11
当一切再次出现时，似乎这些设备是显示器中的 USB 集线器、键盘和鼠标（分别1-11.1是1-11.2）：
3 20:12:06 rudolfs-Alienware-m15-R3 kernel: [ 5957.323800] usb 1-11: new high-speed USB device number 10 using xhci_hcd
Feb 3 20:12:06 rudolfs-Alienware-m15-R3 kernel: [ 5957.748121] usb 1-11: New USB device found, idVendor=0451, idProduct=8442, bcdDevice= 1.00
Feb 3 20:12:06 rudolfs-Alienware-m15-R3 kernel: [ 5957.748127] usb 1-11: New USB device strings: Mfr=0, Product=0, SerialNumber=1
Feb 3 20:12:06 rudolfs-Alienware-m15-R3 kernel: [ 5957.748131] usb 1-11: SerialNumber: E4010869A2EA
Feb 3 20:12:06 rudolfs-Alienware-m15-R3 kernel: [ 5957.749738] hub 1-11:1.0: USB hub found
Feb 3 20:12:06 rudolfs-Alienware-m15-R3 kernel: [ 5957.749786] hub 1-11:1.0: 6 ports detected
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.039762] usb 1-11.1: new full-speed USB device number 11 using xhci_hcd
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.141685] usb 1-11.1: New USB device found, idVendor=1532, idProduct=005c, bcdDevice= 2.00
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.141691] usb 1-11.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.141694] usb 1-11.1: Product: Razer DeathAdder Elite
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.141697] usb 1-11.1: Manufacturer: Razer
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.462582] usb 1-11.2: New USB device found, idVendor=046d, idProduct=c339, bcdDevice=13.00
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.462583] usb 1-11.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.462584] usb 1-11.2: Product: Pro Gaming Keyboard
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.462585] usb 1-11.2: Manufacturer: Logitech
Feb 3 20:12:07 rudolfs-Alienware-m15-R3 kernel: [ 5958.462586] usb 1-11.2: SerialNumber: 086B367A3231
当一切运行时，输出为lspci -tv：
rudolfs@rudolfs-Alienware-m15-R3:~$ lspci -tv
-[0000:00]-+-00.0 Intel Corporation Device 9b54
+-01.0-[01-03]----00.0-[02-03]----00.0-[03]--+-00.0 Advanced Micro Devices, Inc. [AMD/ATI] Device 7340
| \-00.1 Advanced Micro Devices, Inc. [AMD/ATI] Device ab38
+-01.1-[04]--
+-02.0 Intel Corporation Device 9bc4
+-04.0 Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
+-12.0 Intel Corporation Device 06f9
+-13.0 Intel Corporation Device 06fc
+-14.0 Intel Corporation Device 06ed
+-14.2 Intel Corporation Device 06ef
+-15.0 Intel Corporation Device 06e8
+-16.0 Intel Corporation Device 06e0
+-1b.0-[05-3d]----00.0-[06-3d]--+-00.0-[07]----00.0 Intel Corporation JHL7540 Thunderbolt 3 NHI [Titan Ridge 2C 2018]
| +-01.0-[08-3c]--
| \-02.0-[3d]----00.0 Intel Corporation JHL7540 Thunderbolt 3 USB Controller [Titan Ridge 2C 2018]
+-1b.4-[3e]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981
+-1d.0-[3f]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM951/PM951
+-1d.4-[40]----00.0 SK hynix Device 1339
+-1d.6-[41]----00.0 Realtek Semiconductor Co., Ltd. Device 3000
+-1d.7-[42]----00.0 Intel Corporation Device 2723
+-1f.0 Intel Corporation Device 068d
+-1f.3 Intel Corporation Device 06c8
+-1f.4 Intel Corporation Device 06a3
\-1f.5 Intel Corporation Device 06a4
的输出lsusb -tv是：
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M
/: 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/8p, 10000M
|__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 4: Dev 3, If 0, Class=Mass Storage, Driver=uas, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
|__ Port 4: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 7: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 7: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 10: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 12M
|__ Port 10: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 11: Dev 15, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 5: Dev 18, If 0, Class=Human Interface Device, Driver=usbhid, 480M
|__ Port 1: Dev 16, If 1, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 1: Dev 16, If 2, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 1: Dev 16, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 17, If 1, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 17, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 14: Dev 5, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 14: Dev 5, If 1, Class=Wireless, Driver=btusb, 12M
在写这篇文章之前，我进行了大量谷歌搜索，因此我看到提到的相关内容：
- BIOS 中的 Thunderbolt 安全性已关闭
bolt软件包已安装- 设备/Thunderbolt 面板中没有显示任何内容，但我认为这没问题，因为所连接的设备（2 个显示器、键盘和鼠标）实际上都不是 Thunderbolt 设备？
有人提到雷电端口在不活动时会进入睡眠状态 - 所以我不明白另一端（在显示器中）的 USB 集线器是否应该保持它们处于活动状态？这个问题非常烦人，因为我实际上需要使用 Android 模拟器，但运行它会使机器无法使用。有什么建议吗？我可以提供任何其他需要的信息。
不确定这是否与问题有关，但我在 Ubuntu 软件设置中有一个未知设备（我认为它是 Killer Wireless 卡，即使 wifi 可以工作）。
实际上刚刚注意到有这些错误的单个块：
Feb 3 20:12:30 rudolfs-Alienware-m15-R3 kernel: [ 5981.555749] usb 1-11: new high-speed USB device number 14 using xhci_hcd
Feb 3 20:12:30 rudolfs-Alienware-m15-R3 kernel: [ 5981.638519] usb 4-1: Device not responding to setup address.
Feb 3 20:12:30 rudolfs-Alienware-m15-R3 kernel: [ 5981.683827] usb 1-11: Device not responding to setup address.
Feb 3 20:12:31 rudolfs-Alienware-m15-R3 kernel: [ 5981.850723] usb 4-1: Device not responding to setup address.
Feb 3 20:12:31 rudolfs-Alienware-m15-R3 kernel: [ 5981.891708] usb 1-11: Device not responding to setup address.
Feb 3 20:12:31 rudolfs-Alienware-m15-R3 kernel: [ 5982.055666] usb 4-1: device not accepting address 3, error -71
Feb 3 20:12:31 rudolfs-Alienware-m15-R3 kernel: [ 5982.099676] usb 1-11: device not accepting address 14, error -71
和：
Feb 3 20:12:35 rudolfs-Alienware-m15-R3 kernel: [ 5986.151734] usb usb4-port1: Cannot enable. Maybe the USB cable is bad?
Feb 3 20:12:35 rudolfs-Alienware-m15-R3 kernel: [ 5986.151820] usb usb4-port1: attempt power cycle