network don't work after longtime suspend mode

[Alex_ander]

when my system in suspend mode for long time (1 hour or more) - network connection is down. Only reboot saving.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager 0.9.8.4-0ubuntu1
ProcVersionSignature: Ubuntu 3.12.0-1.3-generic 3.12.0-rc7
Uname: Linux 3.12.0-1-generic i686
ApportVersion: 2.12.6-0ubuntu1
Architecture: i386
Date: Mon Nov 4 23:22:26 2013
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-07-26 (101 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130726)
IpRoute:
 default via 192.168.0.1 dev wlan0 proto static
 192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.100 metric 9
MarkForUpload: True
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2013-10-08T20:01:22.891003
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/1
 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.4 connected enabled enabled enabled enabled disabled

[Thaddaeus Tintenfisch (thad-fisch-deactivatedaccount)]

Duplicate of bug 1184262.

[Launchpad Janitor (janitor)]

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

[Alberto Salvia Novella (es20490446e)]

It affects a non-essential hardware component (removable network card, camera, web-cam, music player, sound card, power management feature, printer...).

[IanH (ian-hanson4)]

Closing the lid on my netbook initiates Suspend mode. When I switch the netbook back on the Wifi does not work on Ubuntu 14.04 but it did work on previous releases 12.04, 11.04, etc. I have to Restart to get Wifi working again.