我在一台新的 Dell Precision 5820 上运行 Xubuntu 19.10。这台机器运行了几个星期，直到今天都运行良好。现在，登录几分钟后，键盘和鼠标就停止响应了。系统没有冻结（正在运行的应用程序继续冻结，没有问题），但我无法提供任何输入。无法移动鼠标或单击，无法切换到虚拟终端，没有 SysReq 组合，什么都没有。按下键时，键盘上的 CapsLock 灯不再切换。
根据此信息和一些日志条目（粘贴在下面），我猜测问题总体上出在 USB 设备上。
我尝试过启动到较早的内核版本、以其他用户身份登录、拔下并重新插入键盘和鼠标以及插入第二个键盘，但这些都无济于事。任何帮助都非常感谢，机器此时基本上无法使用——我登录后几分钟就会发生这种情况。
我从 /var/log/syslog 复制了一些可能相关的条目。每当出现问题时，都会出现类似的消息。
Apr 3 11:38:05 RACHMANINOFF3 kernel: [ 2081.985153] usb 1-4: reset high-speed USB device number 3 using xhci_hcd
Apr 3 11:38:11 RACHMANINOFF3 kernel: [ 2087.220959] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
Apr 3 11:38:16 RACHMANINOFF3 kernel: [ 2092.596995] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
Apr 3 11:38:16 RACHMANINOFF3 kernel: [ 2092.805041] usb 1-4: device not accepting address 3, error -62
Apr 3 11:38:16 RACHMANINOFF3 kernel: [ 2092.933109] usb 1-4: reset high-speed USB device number 3 using xhci_hcd
Apr 3 11:38:21 RACHMANINOFF3 kernel: [ 2097.973165] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
Apr 3 11:38:27 RACHMANINOFF3 kernel: [ 2103.349154] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
Apr 3 11:38:27 RACHMANINOFF3 kernel: [ 2103.557150] usb 1-4: device not accepting address 3, error -62
Apr 3 11:38:27 RACHMANINOFF3 kernel: [ 2103.685160] usb 1-4: reset high-speed USB device number 3 using xhci_hcd
Apr 3 11:38:32 RACHMANINOFF3 kernel: [ 2108.853249] usb 1-4: device descriptor read/64, error -110
Apr 3 11:38:48 RACHMANINOFF3 kernel: [ 2124.469303] usb 1-4: device descriptor read/64, error -110
Apr 3 11:38:48 RACHMANINOFF3 kernel: [ 2124.705353] usb 1-4: reset high-speed USB device number 3 using xhci_hcd
Apr 3 11:38:53 RACHMANINOFF3 kernel: [ 2129.845386] usb 1-4: device descriptor read/64, error -110
Apr 3 11:39:09 RACHMANINOFF3 kernel: [ 2145.461490] usb 1-4: device descriptor read/64, error -110
Apr 3 11:39:09 RACHMANINOFF3 kernel: [ 2145.569571] usb 1-4: USB disconnect, device number 3
Apr 3 11:39:09 RACHMANINOFF3 kernel: [ 2145.797464] usb 1-4: new high-speed USB device number 9 using xhci_hcd
Apr 3 11:39:14 RACHMANINOFF3 kernel: [ 2150.965415] xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command.
Apr 3 11:39:14 RACHMANINOFF3 kernel: [ 2150.965422] xhci_hcd 0000:00:14.0: xHCI host controller not responding, assume dead
Apr 3 11:39:14 RACHMANINOFF3 kernel: [ 2150.965468] xhci_hcd 0000:00:14.0: HC died; cleaning up
Apr 3 11:39:14 RACHMANINOFF3 kernel: [ 2150.965490] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
Apr 3 11:39:14 RACHMANINOFF3 kernel: [ 2150.965507] usb 2-9: USB disconnect, device number 2
Apr 3 11:39:14 RACHMANINOFF3 kernel: [ 2151.041981] usb 2-10: USB disconnect, device number 3
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.385436] usb 1-4: device not accepting address 9, error -108
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.385496] usb usb1-port4: couldn't allocate usb_device
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.385519] usb 1-3: USB disconnect, device number 2
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.385777] usblp0: removed
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.386106] usb 1-5: USB disconnect, device number 4
Apr 3 11:39:15 RACHMANINOFF3 acpid: input device has been disconnected, fd 13
Apr 3 11:39:15 RACHMANINOFF3 acpid: input device has been disconnected, fd 15
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.565979] usb 1-6: USB disconnect, device number 5
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.630059] usb 1-7: USB disconnect, device number 6
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.630431] usb 1-10: USB disconnect, device number 7
Apr 3 11:39:15 RACHMANINOFF3 kernel: [ 2151.630435] usb 1-10.2: USB disconnect, device number 8