@jerrylamos: Does it help if you create a file /etc/modprobe.d/iwlwifi-
disable11n.conf with the contents

    options iwlwifi 11n_disable=1

and then reboot?

** Summary changed:

- NM fails to connect Wi-Fi -- Intel Centrino Wireless-N 1000 iwlwifi
+ NM fails to connect Wi-Fi; dhclient works -- Intel Centrino Wireless-N 1000 
iwlwifi

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1017738

Title:
  NM fails to connect Wi-Fi; dhclient works -- Intel Centrino Wireless-N
  1000 iwlwifi

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Wireless WPA fails to "automatically connect" even though "enable
  wireless" is on when rebooting.

  Systems Settings Network  is blank where it should have the network
  name.   That's a bug.

  Correctly says wired network is unplugged.

  Network Applet Edit Connections says wired connection last used 5
  minutes ago.  Has not been plugged in since yesterday.  That's a bug.

  Network Applet Edit Connections says wireless connection last used 2
  hours ago.  Not true, last used 5 minutes ago.  That's a bug.

  Selecting Network Applet Edit Connections Wireless Security tab should
  ask for pathword authorization to set/change password.  It does not.
  That's a bug.

  What the Wireless Security tab does is just sit there for a couple
  minutes then (60 to 120 seconds) the menu appears.  All the correct
  data is already there.  Save, close.  No changes made.

  Wireless WPA still does not connect even though it was running before
  reboot.  "connect automatically" does not. That's a bug.

  Systems Settings Network still shows no network name while network applit 
edit connections shows the correct name.
  Why don't they both show the same network name?  That's a bug.

  After 20 minutes, it suddenly does show the network name.  Some time
  after that the wireless WPA connects.

  No new information was used.  It already had network name, security
  type, and  password when it rebooted.  "cinnect automatically" does
  not.  That's a bug.

  Any clue what to do to "automatically connect"?  This is a
  "Regression" since Precise works very usably on the same hardware.

  Jerry

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: network-manager 0.9.4.0+git201206081144.2efeac8-0ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-1.1-generic 3.5.0-rc3
  Uname: Linux 3.5.0-1-generic i686
  ApportVersion: 2.2.5-0ubuntu1
  Architecture: i386
  Date: Mon Jun 25 18:39:51 2012
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120625)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.3-0ubuntu4
  Architecture: i386
  DistroRelease: Ubuntu 12.10
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120708.1)
  IpRoute:
   default via 192.168.0.1 dev wlan0  proto static 
   169.254.0.0/16 dev wlan0  scope link  metric 1000 
   192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.7  metric 9
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  Package: network-manager 0.9.4.0+git201206081144.2efeac8-0ubuntu1
  PackageArchitecture: i386
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6
  Tags:  quantal running-unity
  Uname: Linux 3.5.0-4-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  nmcli-con:
   NAME                      UUID                                   TYPE        
      TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   
DBUS-PATH                                 
   Wired connection 1        db29e980-6d85-4cd3-8f83-c4252d4f3755   
802-3-ethernet    1342096724   Thu 12 Jul 2012 08:38:44 AM EDT    yes           
no         /org/freedesktop/NetworkManager/Settings/1
   LAUREL                    28dda2b6-dcd4-4a4d-8b33-6d4d1d9d99b5   
802-11-wireless   1342097083   Thu 12 Jul 2012 08:44:43 AM EDT    yes           
no         /org/freedesktop/NetworkManager/Settings/0
  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         0.9.4.0    connected       enabled       enabled         
enabled    enabled         disabled

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