wireless network list disappears

[Juraj]

On Thinkpad W520, wireless network list disappears occasionally. Restarting the network manager service fixes the issue. Please see the following bug for more information:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1590985

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.2-0ubuntu0.16.04.3
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Uname: Linux 4.4.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 26 13:57:59 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-07-12 (105 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 enp0s25 ethernet connected /org/freedesktop/NetworkManager/Devices/1 LARICS 3ad4f968-8fd1-4759-a3bc-746cb364628e /org/freedesktop/NetworkManager/ActiveConnection/2
 wlp3s0 wifi connected /org/freedesktop/NetworkManager/Devices/0 FERwlan 3f100dda-2c1b-46d6-83af-064c33b51c5a /org/freedesktop/NetworkManager/ActiveConnection/3
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/2 -- -- --
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.2.2 connected started full enabled enabled enabled enabled enabled

[penalvch (penalvch)]

Juraj, thank you for reporting this and helping make Ubuntu better. To better understand:

1) Did this problem not occur in a Ubuntu release prior to 16.04?
2) When precisely does the wireless network list disappear (i.e. after doing what, is it consistently reproducible, etc.)?
3) Is this reproducible via http://cdimage.ubuntu.com/daily-live/current/ ?

[Juraj (ojura)]

1) No, it definitely did not occur in 14.04. I believe it's a regression.
2) James Ferguson noted here (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1590985/comments/7) that he gets the bug after resuming from suspend. I will update later with more specifics, but I consistently get the bug when running Ubuntu for some time (an hour, couple of hours?), perhaps doing a suspend. I get the same behaviour like James that it's still connected, but network-manager doesn't display the active connection nor other connections.
3) Also will update later.

[penalvch (penalvch)]

Juraj, for you personally (not someone else), was there a version of Ubuntu later than 14.04, but earlier than 16.04 where this didn't occur?

[Juraj (ojura)]

Sorry I can't answer all the questions right now, as I'm in a bit of a rush and can't try out all the old versions of Ubuntu right now. And the bug doesn't manifest itself that often, so it's hard to pinpoint what exactly triggers it. For now I can confirm that I have experienced the bug on Thinkpad T520 too. As before, restarting the NetworkManager service fixes the issue.

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]