Often after resuming from suspend, my laptop (Samsung series 9) is disconnected from the wifi and it doesn't seem to reconnect. Network manager seems confused; it displays that it is connected, but it shows the wrong access point (i.e. one of my neighbour's access points that I don't even have the password for).
Running iwlist scan manually fixes the problem almost immediately and network-manager starts showing the correct state (connecting, then connected to the right AP).
Very similar to bug 1332904 but apport recommended filing diags on a fresh bug report.
Wifi card appears to be "Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)" according to lspci.
---
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
IfupdownConfig:
auto lo
iface lo inet loopback
InstallationDate: Installed on 2012-09-26 (1515 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120905.2)
IpRoute:
default via 192.168.1.254 dev wlan0 proto static metric 600
169.254.0.0/16 dev docker0 scope link metric 1000 linkdown
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.241 metric 600
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
Package: network-manager 1.2.2-0ubuntu0.16.04.3
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Tags: xenial
Uname: Linux 4.4.0-45-generic x86_64
UpgradeStatus: Upgraded to xenial on 2016-04-25 (207 days ago)
UserGroups: adm cdrom dialout dip docker lpadmin plugdev sambashare sudo wireshark
_MarkForUpload: True
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
apport information