Sometimes WLAN detects no SSID after s3

[Kristin Chuang]

[Steps to reproduce]
1. Boot into OS
2. Do s3 a few times
3. Check if wifi is still working after s3

[Expected results]
wifi still working correctly after s3

[Actual results]
1. Wifi shows "disconnected" in network-manager (both in applet and from command "nmcli d status")
2. Only one random SSID is displayed in network-manager applet, but wifi connection cannot be established at all with this SSID. Clicking on the SSID results in pop up window in the comment #2 below
3. "nmcli d wifi rescan" does not resolve issue
4. "iwlist [interface] scan" returns nothing and does not reolve issue
5. "nmcli d wifi connect [any SSID that you know should exist]" results in SSID not found and does not resolve issue
6. "sudo service network-manager restart", warm boot, cold boot resolves issue

[Details]
OS: Xenial based OEM image
WLAN module: Marvel [11ab:2b38]
network-manager:
- 1.2.0-0ubuntu0.16.04.1 (fail rate 1/20~ 1/15)
- 1.1.93 (fail rate 1/15)

[Kristin Chuang (kristinchuang)]

network-manager applet screenshot when issue occurred:
Wifi is shown as "disconnected" and only one random SSID is displayed

[Kristin Chuang (kristinchuang)]

pop up window shown when trying to connect to the random SSID available

[Chih-Hsyuan Ho (chih)]

syslog when issue happens with NetworkManager 1.2 on Ubuntu 16.04

[John McAleely (john.mcaleely)]

May relate to: https://askubuntu.com/questions/761180/wifi-doesnt-work-after-suspend-after-16-04-upgrade

[Chih-Hsyuan Ho (chih)]

Issue was also seen with the NM 1.2 found in the -proposed repository for Xenial.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Could you try with the new version in proposed? it include an extra bugfix that might fix that issue

[Ara Pulido (ara)]

Marking as Incomplete, as we are waiting on a retest

[Sebastien Bacher (seb128)]

the version to test with is https://launchpad.net/ubuntu/+source/network-manager/1.2.0-0ubuntu0.16.04.2

[Chih-Hsyuan Ho (chih)]

On the Dell platform where this bug was originally reported on, with the latest network manager package, the issue was no longer seen.

[Ara Pulido (ara)]

Marking as Fix Released, based on Chih's comment