Bug 411220

Summary:	No wired connection available after suspension
Product:	[Plasma] plasmashell	Reporter:	Vladislav Rubtsov <rubstov>
Component:	Networking in general	Assignee:	Jan Grulich <jgrulich>
Status:	RESOLVED NOT A BUG
Severity:	normal
Priority:	NOR
Version First Reported In:	master
Target Milestone:	1.0
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Vladislav Rubtsov 2019-08-23 21:30:41 UTC

SUMMARY
After the recent updates, whenever my laptop wakes up from suspension, wired connection (via Ethernet adapter) is not restored and completely vanishes from the connections list in Network Manager (as if the wire has been physically disconnected).

So far, I haven't found any way to restore it, which is insanely annoying.
- Reconnecting the wire doesn't work;
- Restarting "NetworkManager" and/or "networking" services doesn't help, but introduce more bugs (wireless connection stop working due to missing secrets);
- Replacing "plasmashell" doesn't affect it;
- Judging by "ifconfig" output, the Ethernet interface is UP and completely functional after suspension.


STEPS TO REPRODUCE
1. Suspend to RAM.
2. Wake it up.

OBSERVED RESULT
Wired connection no longer works and is not visible in Network Manager.

EXPECTED RESULT
Wired connection to work normally.

SOFTWARE/OS VERSIONS
OS: KDE neon 5.16
Kernel: x86_64 Linux 5.0.0-25-generic
Uptime: 14m
Packages: 3086
Shell: bash 4.4.20
Resolution: 3280x1248
DE: KDE 5.61.0 / Plasma 5.16.4
WM: KWin
GTK Theme: Breeze [GTK2/3]
Icon Theme: breeze
Font: Noto Sans Regular
CPU: Intel Core i7-6700HQ @ 8x 3.5GHz [54.0°C]
GPU: GeForce GTX 950M
RAM: 1719MiB / 11898MiB

ADDITIONAL INFORMATION
Ethernet interface is "enp3s0f1".
The device is "Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller".

Comment 1 Vladislav Rubtsov 2019-08-23 21:33:10 UTC

So far, the only way to restore connection for me is a reboot.
After reboot, Wired Connection becomes available as usual.

Comment 2 Vladislav Rubtsov 2019-08-23 21:44:10 UTC

Found a workaround all of a sudden.

Removing kernel module "r8169" (which is my Ethernet adapter driver) and then loading it again seems to restore the connection:

# modprobe -r r8169
# modprobe r8169

Does it mean it's possibly a kernel-level bug?

Comment 3 Vladislav Rubtsov 2019-08-23 21:54:03 UTC

Kernel bug confirmed: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1752772

Somehow, this is still present in 5.0.0 kernel.
This has nothing to do with KDE's Network Manager.

Comment 4 Ben Cooksley 2024-12-23 18:23:48 UTC

Bulk transfer as requested in T17796