I have observed this issue on both Broadcom and Atheros (ath10k) wireless cards, and even reproduced it on the current stable 4.9.13 kernel, thus it would appear to be a higher-level issue. Running 'sudo iw dev wlan0 scan' works around it every time.
** Changed in: network-manager (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1589401 Title: cannot view wifi networks after re-enabling wifi Status in NetworkManager: Unknown Status in network-manager package in Ubuntu: Confirmed Bug description: after re enabling wifi, up-down arrows just like wired network. cannot see any wifi ssid. To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1589401/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp