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
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Hirsute:
Confirmed
Bug description:
[SRU Justification]
[Impact]
The network card will be unavailable after system resume if the interface is
not UP before suspend.
[Fix]
It's because we added the WOL support for this driver. The driver with WoL
feature does detach the network interface even the interface is DOWN. However,
it doesn't attach the network interface back on resume if it was DOWN. That's
why it's unavailable after resume. Fix this by correctly netif_device_attach
according to the interface status.
[Test Case]
1. Plug the ethernet cable to the Atheros E220x ethernet adapter
2. Suspend the system and check if the ethernet interface available after
resume
3. Unplug the ethernet cable
4. Suspend the system and check if the ethernet interface available after
resume
[Regression Potential]
Low. The driver code would be identical to working Groovy version after fix.
========== Original Bug Description ==========
Upgraded to 21.04 (hirsute) and now the network card is unavailable
after suspend to RAM (sleep state S3). It worked flawlessly up until
20.10. My workaround for now is unloading and reloading the kernel
module, but that won't work for normal users, hence this report.
NIC in its unavailable state:
2: enp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default
qlen 1000
link/ether d0:50:99:27:02:11 brd ff:ff:ff:ff:ff:ff
NIC (from lspci):
04:00.0 Ethernet controller: Qualcomm Atheros Killer E220x Gigabit Ethernet
Controller (rev 10)
Trying to ifconfig it down/up results in:
SIOCSIFFLAGS: No such device
journalctl shows (right after recovering from suspend):
NetworkManager[1911]: <info> [1623181236.9371] manager: sleep: wake
requested (sleeping: yes enabled: yes)
NetworkManager[1911]: <info> [1623181236.9372] device (enp4s0): state
change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
NetworkManager[1911]: <info> [1623181236.9382] manager: NetworkManager
state is now CONNECTED_LOCAL
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: network-manager 1.30.0-1ubuntu3
ProcVersionSignature: Ubuntu 5.11.0-18.19-generic 5.11.17
Uname: Linux 5.11.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Tue Jun 8 21:59:15 2021
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
InstallationDate: Installed on 2016-08-25 (1748 days ago)
InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
RfKill:
SourcePackage: network-manager
UpgradeStatus: Upgraded to hirsute on 2021-06-04 (4 days ago)
nmcli-nm:
RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW
WIFI WWAN-HW WWAN
running 1.30.0 connected started full enabled enabled
enabled enabled enabled
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