Lsusb -vvv while Ethernet is not working Bus 004 Device 002: ID 0b95:1790 ASIX Electronics Corp. It does not appear to be related to power management in an obvious manner, as the problem happens while actively working. The laptop is relatively new and it seems unlikely to be a problem with the USB port as that port functions normally otherwise. I have observed the problem with two different Ethernet adapters, so it seems unlikely that it is a faulty adapter. Performing ip link set dev eth0 down followed by ip link set dev eth0 up does not work and NetworkManager continues to be unable to obtain an IP address. Either works in the short term, but this problem happens every few hours at random intervals. (The cable is good.) I can resolve the problem in two ways: either unplug and replug the USB-Ethernet adapter or reboot the laptop. The connectivity lights on the USB-Ethernet adapter are off, as if the cable is unplugged. NetworkManager tries to connect and to obtain an IP address via DHCP but each attempt fails. Periodically, while actively working, the connection is lost. My laptop uses a USB-Ethernet adapter for a wired connection.
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