Public bug reported:
When resuming from sleep or coming out of hibernation and sometimes when
disabing and reenabling the wireless card (using Fn + the corresponding
key), network-manager will stop recognizing that there's a wireless card
in my laptop. The bluetooth applet and the card themselves still work. I
can still connect to the same network it was connected before putting it
to sleep/hibernate (because it's a known network and it does so
automatically) but network-manager won't display anything regarding me
having a wireless card, displaying the icon and information I would
expect if I were connected using an ethernet cable.
A workaround consists in restarting the network-manager service using
systemctl
sudo service network-manager restart
or
sudo systemctl restart network-manager.service
The system is a Dell Vostro 5470 running a fresh installation of Ubuntu
16.04.1. If I recall correctly, this also happened with Ubuntu 14.04.4 too.
BIOS version is A12 (the latest).
I've seen several people with problems like this one that were solved by
restarting network-manager (a quick Googling shows a handful of such
cases). This can be a huge turn off for a newcomer.
Some people also suggested creating a systemd service to restart the
network-manager service when resuming, etc. but since this bug also
occurs when disabling/reenabling the card, it might have another cause
that's unrelated to resuming from sleep.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.0-0ubuntu0.16.04.3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Sep 16 01:26:01 2016
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
InstallationDate: Installed on 2016-09-10 (6 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IpRoute:
default via 192.168.1.1 dev wlp8s0 proto static metric 600
169.254.0.0/16 dev wlp8s0 scope link metric 1000
192.168.1.0/24 dev wlp8s0 proto kernel scope link src 192.168.1.248 metric
600
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
ProcEnviron:
LANGUAGE=pt_BR:pt:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=pt_BR.UTF-8
SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
CONNECTION CON-UUID CON-PATH
wlp8s0 wifi connected /org/freedesktop/NetworkManager/Devices/0
That's no moon! 1 2a59043a-02a4-4da0-ab5c-3c89c52bd15f
/org/freedesktop/NetworkManager/ActiveConnection/1
enp7s0 ethernet unavailable /org/freedesktop/NetworkManager/Devices/1 --
-- --
lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/2 --
-- --
nmcli-nm:
RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI
WWAN-HW WWAN
running 1.2.0 connected started full enabled enabled
enabled enabled enabled
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug network-manager wireless xenial
** Attachment added: "This is what happens."
https://bugs.launchpad.net/bugs/1624211/+attachment/4741747/+files/Espa%C3%A7o%20de%20Trabalho%201_005.png
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https://bugs.launchpad.net/bugs/1624211
Title:
Network-manager randomly won't recognize wireless card after resuming
from sleep or hibernation or when disabling/reenabling the card
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