I have also observed this. And it was not after suspending and resuming. I hadn't suspended/resumed since the previous boot which was just a few minutes before.
It is NOT systematic. Usually, when I turn off and on wifi in the hardware as a workaround for bug #1491612, it does force a rescan. This time, however, it wouldn't, even after retrying several times. Since I didn't know about the command "iwlist scan", I had to reboot. -- 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
