Public bug reported:

System has a Realtek network card, so r8169 driver is used.

The behaviour occurs under the following circumstances:

$ sudo ethtool enp1s0

reports

        Supports Wake-on: pumbg
        Wake-on: d

If in this case I send the system to standby (ALT-key plus pause symbol
from the control dropdown) then the system goes to standby. After waking
up the system the network connectivity is lost and the control panel for
network settings reports "cable disconnected".

The strange thing is: If I set the WOL properties to g with

$ sudo ethtool -s enp1s0 wol g

and do exactly the same, then the problem does not occur. I assume there
is a bug in the standby handling of the r8169 driver because network
connectivity shouldn't get lost if WOL is disabled.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-29-generic 4.15.0-29.31
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  rainer     1401 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Thu Jan 24 11:03:13 2019
InstallationDate: Installed on 2019-01-23 (0 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
IwConfig:
 lo        no wireless extensions.
 
 enp1s0    no wireless extensions.
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 1267:0103 Logic3 / SpectraVideo plc G-720 Keyboard
 Bus 001 Device 002: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic 
root=UUID=d0aba4e1-c5f2-4968-bc5e-7d256035ae10 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-29-generic N/A
 linux-backports-modules-4.15.0-29-generic  N/A
 linux-firmware                             1.173.3
RfKill:
 
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/07/2018
dmi.bios.vendor: FUJITSU // American Megatrends Inc.
dmi.bios.version: V5.0.0.13 R1.11.0 for D3600-A1x
dmi.board.name: D3600-A1
dmi.board.vendor: FUJITSU
dmi.board.version: S26361-D3600-A1
dmi.chassis.type: 3
dmi.chassis.vendor: FUJITSU
dmi.modalias: 
dmi:bvnFUJITSU//AmericanMegatrendsInc.:bvrV5.0.0.13R1.11.0forD3600-A1x:bd11/07/2018:svnFUJITSU:pn:pvr:rvnFUJITSU:rnD3600-A1:rvrS26361-D3600-A1:cvnFUJITSU:ct3:cvr:
dmi.product.family: ESPRIMO-FTS
dmi.sys.vendor: FUJITSU

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1813142

Title:
  Network connection lost after standby

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