I have the same symptom (wifi ends up disconnected after resume, cured by running a scan manually) but I'm seeing this after upgrading to 16.04.
One oddity is that network-manager often shows that it thinks it is connected to an AP after resume but it's not the correct one. It seems to think it is connected to my neighbour's AP, for example. I wondered if the APs had swapped channels due to autodetection or something. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1332904 Title: Network manager stopped scanning for wifi networks Status in network-manager package in Ubuntu: Confirmed Bug description: After I resumed my laptop from suspend, it would not connect to wifi. For a while, it seemed confused about its connection state, then it displayed "disconnected", and showed that there were no wifi networks available (which is not true). To debug the problem, I ran "nmcli d wifi list", which showed no results. Then I ran "iwlist scan", which also showed no results. Then I tried "sudo iwlist scan" - which showed all the wifi networks, and actually caused the network manager to start working again. It connected to a network successfully, and so on. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: network-manager 0.9.8.8-0ubuntu7 ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2 Uname: Linux 3.13.0-30-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 CurrentDesktop: KDE Date: Sat Jun 21 22:12:35 2014 EcryptfsInUse: Yes IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2013-04-05 (443 days ago) InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1) IpRoute: default via 192.168.1.1 dev wlan0 proto static 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.34 metric 9 SourcePackage: network-manager UpgradeStatus: Upgraded to trusty on 2014-05-14 (39 days ago) nmcli-dev: DEVICE TYPE STATE DBUS-PATH wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/0 nmcli-nm: RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN running 0.9.8.8 connected enabled enabled enabled enabled disabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1332904/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
