我使用的是 Ubuntu 20.04，我的计算机的网络摄像头已经出现故障一段时间了。在睡眠/挂起时，我看到了很多usb 1-8: device descriptor read/8, error -71错误。我查看了dmesg输出，发现相机不断断开/重新连接。输出如下dmesg所示：
[ +4.783224] usb 1-8: device descriptor read/8, error -71
[ +0.125049] usb 1-8: device descriptor read/8, error -71
[ +0.107840] usb usb1-port8: unable to enumerate USB device
[ +0.275899] usb 1-8: new high-speed USB device number 54 using xhci_hcd
[ +5.264005] usb 1-8: device descriptor read/64, error -71
[ +5.131901] usb 1-8: device descriptor read/64, error -71
[ +0.232009] usb 1-8: new high-speed USB device …