I have the exact same problem using 21.04. After resume it says
something about the network cable being unplugged in the settings menu
under network wired. I have found rebooting is the fastest way (only way
that I know that works) to get back running. My work around is to not
suspend. Configuration information:
lshw -C network outpu (with the network running)
*-network
description: Ethernet interface
product: Killer E2400 Gigabit Ethernet Controller
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:04:00.0
logical name: enp4s0
version: 10
serial: 00:4e:01:ac:76:26
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix bus_master cap_list ethernet
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=alx
driverversion=5.11.0-25-generic duplex=full ip=192.168.1.25 latency=0 link=yes
multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:19 memory:ec500000-ec53ffff ioport:d000(size=128)
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https://bugs.launchpad.net/bugs/1931301
Title:
NIC unavailable after suspend to RAM
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