1

Sometime yesterday I lost my wired ethernet network connection. It no longer appears in network manager, nor does it seem to be active in ifconfig, though the wireless adapter is.

Possible clues: This seemed to happen shortly after a network-manager (1.22.10-1ubuntu2.2/3) update, but there was also a kernel update (5.4.0-97.110) and system76-driver (20.04.47~1641830102~20.04~12f1c0f~dev, 20.04.48~1643752136~20.04~8120238~dev).

Attempted mitigations: I tried installing the script described here, the r8168-dkms kernel module described here, and doing a full shutdown and restart, to no avail.

Output of possibly relevant commands:

sudo lshw -C network
  *-network DISABLED        
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0.1
       bus info: pci@0000:6d:00.1
       logical name: enp109s0f1
       version: 12
       serial: 80:fa:5b:3f:01:33
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.048.00-NAPI duplex=full latency=0 link=no multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:125 ioport:d000(size=256) memory:dc204000-dc204fff memory:dc200000-dc203fff
  *-network
       description: Wireless interface
       product: Wireless 8265 / 8275
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:6e:00.0
       logical name: wlp110s0
       version: 78
       serial: 00:28:f8:35:58:4a
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.15.15-76051515-generic firmware=36.ca7b901d.0 8265-36.ucode ip=192.168.0.14 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:129 memory:dc100000-dc101fff

cat /etc/netplan/*.yaml

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager

cat /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
Jeff Trull
  • 121

1 Answers1

1

I cannot explain why this was necessary, but the solution came down to ensuring that the wired interface was "managed". I changed /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf from:

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma

to:

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma,except:type:ethernet

And now my wired interface comes up immediately. No new cables, drivers, or scripts were required.

Jeff Trull
  • 121