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retnikt

Member

Registered: 2020-04-04

Posts: 2

Ethernet keeps connecting and disconnecting after suspend

After my PC wakes up from suspend (sleep) the ethernet doesn't work and keeps disconnecting and reconnecting.
My ethernet controller is

1b:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

systemctl status NetworkManager:

dhcp4 (enp27s0): activation: beginning transaction (timeout in 45 seconds)
NetworkManager[91910]: <info>  [1586016159.7779] device (enp27s0): state change: ip-config -> deactivating (reason 'user-requested', sys-iface-state: 'managed')
NetworkManager[91910]: <info>  [1586016159.7786] audit: op="device-disconnect" interface="enp27s0" ifindex=2 pid=1015 uid=1000 result="success"
NetworkManager[91910]: <info>  [1586016159.7901] device (enp27s0): state change: deactivating -> disconnected (reason 'user-requested', sys-iface-state: 'managed')
NetworkManager[91910]: <info>  [1586016159.8148] dhcp4 (enp27s0): canceled DHCP transaction
NetworkManager[91910]: <info>  [1586016159.8148] dhcp4 (enp27s0): state changed unknown -> done
NetworkManager[91910]: <info>  [1586016161.4230] audit: op="statistics" arg="refresh-rate-ms" pid=1015 uid=1000 result="success"
NetworkManager[91910]: <info>  [1586016165.1976] device (enp27s0): state change: disconnected -> unavailable (reason 'carrier-changed', sys-iface-state: 'managed')
NetworkManager[91910]: <info>  [1586016166.6056] device (enp27s0): carrier: link connected
NetworkManager[91910]: <info>  [1586016166.6058] device (enp27s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')

retnikt

Member

Registered: 2020-04-04

Posts: 2

Re: Ethernet keeps connecting and disconnecting after suspend

I solved my problem - it was caused by a faulty ethernet cable (even though I got link lights and LOWER_UP in `ip link show`. Always start with the most basic troubleshooting step first!