Once disconnected it don't rescan

[Fabio Marconi]

Hallo
If i lay the computer idle for some time, at the restart I always find it disconnected from wireless.
If I try to uncheck and recheck the enable networking entry in the menu it do not start to scan.
The only way is to stop it and restart it from terminal.
Best regards

ProblemType: Bug
DistroRelease: Ubuntu Kylin 15.04
Package: network-manager 0.9.10.0-4ubuntu11
ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
Uname: Linux 3.19.0-9-generic x86_64
ApportVersion: 2.16.2-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 19 16:45:29 2015
EcryptfsInUse: Yes
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-02-24 (22 days ago)
InstallationMedia: Ubuntu-Kylin 15.04 "Vivid Vervet" - Alpha amd64 (20150224)
IpRoute:
 default via 192.168.0.1 dev wlan0 proto static metric 1024
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.9
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 wlan0 wifi connected /org/freedesktop/NetworkManager/Devices/2 retenjin_EXT 1c19b428-8d36-421f-997b-b5b72a872d8a /org/freedesktop/NetworkManager/ActiveConnection/1
 eth0 ethernet unavailable /org/freedesktop/NetworkManager/Devices/1 -- -- --
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0 -- -- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

[Fabio Marconi (fabiomarconi)]

mar 19 16:10:38 Turtle kernel: wlan0: deauthenticated from 30:46:9a:46:d7:24 (Reason: 7=CLASS3_FRAME_FROM_NONASSOC_STA)

=/=

mar 19 16:43:40 Turtle NetworkManager[616]: <info> disable requested (sleeping: no enabled: yes)

=/=

mar 19 16:43:40 Turtle NetworkManager[616]: <info> (wlan0): device state change: disconnected -> unmanaged (reason 'sleeping') [30 10 37]

=/=

mar 19 16:44:48 Turtle NetworkManager[616]: <info> caught signal 15, shutting down normally.
.....