您好，感谢您的帮助。
今天我更新了 Ubuntu，我的无线鼠标在 USB 2.0 端口上已经完全停止工作了。
当我连接无线鼠标时，我从 sudo dmesg 获得此输出：
> [ 1713.945599] usb 1-4: new full-speed USB device number 24 using
> xhci_hcd [ 1714.081371] usb 1-4: device descriptor read/64, error -71
> [ 1714.321364] usb 1-4: device descriptor read/64, error -71 [
> 1714.561437] usb 1-4: new full-speed USB device number 25 using xhci_hcd [ 1714.689710] usb 1-4: device descriptor read/64, error -71
> [ 1714.925383] usb 1-4: device descriptor read/64, error -71 [
> 1715.037653] usb usb1-port4: attempt power cycle [ 1715.457274] usb 1-4: new full-speed USB device number 26 using xhci_hcd [ 1715.457395]
> usb 1-4: Device not responding to setup address. [ 1715.665359] usb
> 1-4: Device not responding to setup address. [ 1715.873266] usb 1-4:
> device not accepting address 26, error -71 [ 1716.001266] usb 1-4: new
> full-speed USB device number 27 using xhci_hcd [ 1716.001417] usb 1-4:
> Device not responding to setup address. [ 1716.209376] usb 1-4: Device
> not responding to setup address. [ 1716.417231] usb 1-4: device not
> accepting address 27, error -71 [ 1716.417329] usb usb1-port4: unable
> to enumerate USB device
鼠标连接到 USB 2.0 端口。如果我拔下它并将其连接到 USB 3 端口，它就可以完美运行。
在此先感谢您的时间。
问题是线路连接不良。USB 端口有问题，不容易连接设备。
感谢您的关注。