Public bug reported:

Steps: Suspend, wait, resume, a few times.

The Network Manager applet shows WiFi is enabled and shows just one or a
handful of WiFi names, they don't include some that are known to be
available and in use on other computers.

Disabling and enabling WiFi does not fix the problem.

Disabling and enabling networking does not fix the problem.

Adding the following does not help:
/etc/pm/config.d/unload_modules 
SUSPEND_MODULES="$SUSPEND_MODULES iwlwifi"

Only workaround which works perfectly and instantly is to run:
sudo service network-manager restart

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.0-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Jun  4 18:18:50 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-05-30 (4 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 192.168.43.1 dev wlp2s0  proto static  metric 600 
 169.254.0.0/16 dev wlp2s0  scope link  metric 1000 
 192.168.43.0/24 dev wlp2s0  proto kernel  scope link  src 192.168.43.89  
metric 600
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE  TYPE      STATE        DBUS-PATH                                  
CONNECTION                 CON-UUID                              CON-PATH       
                                    
 wlp2s0  wifi      connected    /org/freedesktop/NetworkManager/Devices/0  HTC 
Portable Hotspot DF99  c29b59ba-b6ef-49db-b159-75ec21d3f436  
/org/freedesktop/NetworkManager/ActiveConnection/0 
 enp1s0  ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/1  --   
                      --                                    --                  
                               
 lo      loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/2  --   
                      --                                    --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: 
Error: Object 'nm' is unknown, try 'nmcli help'.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1589125

Title:
  WiFi does not work after about 1 in 4  suspends

Status in network-manager package in Ubuntu:
  New

Bug description:
  Steps: Suspend, wait, resume, a few times.

  The Network Manager applet shows WiFi is enabled and shows just one or
  a handful of WiFi names, they don't include some that are known to be
  available and in use on other computers.

  Disabling and enabling WiFi does not fix the problem.

  Disabling and enabling networking does not fix the problem.

  Adding the following does not help:
  /etc/pm/config.d/unload_modules 
  SUSPEND_MODULES="$SUSPEND_MODULES iwlwifi"

  Only workaround which works perfectly and instantly is to run:
  sudo service network-manager restart

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager 1.2.0-0ubuntu0.16.04.2
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Jun  4 18:18:50 2016
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2016-05-30 (4 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  IpRoute:
   default via 192.168.43.1 dev wlp2s0  proto static  metric 600 
   169.254.0.0/16 dev wlp2s0  scope link  metric 1000 
   192.168.43.0/24 dev wlp2s0  proto kernel  scope link  src 192.168.43.89  
metric 600
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE  TYPE      STATE        DBUS-PATH                                  
CONNECTION                 CON-UUID                              CON-PATH       
                                    
   wlp2s0  wifi      connected    /org/freedesktop/NetworkManager/Devices/0  
HTC Portable Hotspot DF99  c29b59ba-b6ef-49db-b159-75ec21d3f436  
/org/freedesktop/NetworkManager/ActiveConnection/0 
   enp1s0  ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/1  -- 
                        --                                    --                
                                 
   lo      loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/2  -- 
                        --                                    --
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 
2: Error: Object 'nm' is unknown, try 'nmcli help'.

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