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[Ar <arjenmeijer@xxxxxxxxxxx>]

The networkmanager connects at my place to BSSID none. None does not
exists, so the connection is lost and restarted again, and again and
again.

The relevant log is:

<info> (wlan0): roamed from BSSID (none) ((none)) to 7C: (Zadel6)
wpa_supplicant[1076]: wlan0: WPA: Key negotiation completed with 7c: [PTK=CCMP GTK=TKIP]
wlan0: deauthenticated from 7c:(Reason: 15=4WAY_HANDSHAKE_TIMEOUT)
wpa_supplicant[1076]: message repeated 6 times: [ wlan0: WPA: Key negotiation completed with 7c:[PTK=CCMP GTK=TKIP]]
wpa_supplicant[1076]: wlan0: CTRL-EVENT-DISCONNECTED bssid=7c: reason=15
<warn> Connection disconnected (reason 15)

By chance I found the cause. My Cisco router

Firmware Version: 	epc3928a-E10-5-v302r125572-131030c-ZIG
MAC Address: 
Current Time: 	Sat. Nov 22 11:42:30 2014
Router Mode: 	IPv4

has two bands 2,4 Ghz and 5Ghz, both with the same BSSID Zadel6.

In this situation the networkmanager is switching from BSSID Zadel6 to none, none to none and none to Zadel6.
If I disable one of the bands or give it a different BSSID, the switching disappears and the connection is not lost anymore.

If it correct to conclude that the networkmanager is getting confused by
the two bands on the same BSSID?

** Attachment added: "wireless-info.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/495981/+attachment/4265647/+files/wireless-info.tar.gz

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https://bugs.launchpad.net/bugs/495981

Title:
  NM disconnects Wi-Fi every 2 minutes but iwconfig+dhclient and wicd
  don't -- ath9k

Status in “network-manager” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: network-manager

  I have Dell studio XPS 13 running:
  Description:	Ubuntu 9.10
  Release:	9.10

  with wifi card (lspci):
  06:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)

  that works (tries to) with ath9k module.

  It connects to my access point and works ok however, It disconnects every 2-3 min saying (in dmesg):
  [  311.600306] wlan0: RX AssocResp from 00:1d:68:0c:97:63 (capab=0x411 status=0 aid=2)
  and then automatically reconnects... I have tried different drivers and other things....

  Interestingly when I right-clicked on network manger applet, select ¨disable networking¨ and then set up everything myself on console using iwconfig and dhclient..... IT WORKS!!!
  no disconnections....
  wpa_supplicant is still running in a background but not doing anything (my wifi has WEP encryption).

  I´ve seen some similar reports in Internet but they seem to think that
  it is a driver problem when to me it looks like a NetworkManager
  issue...

  Hope it helps....

  drphd

  ProblemType: Bug
  Architecture: amd64
  CRDA: Error: [Errno 2] No such file or directory
  Date: Sat Dec 12 19:42:18 2009
  DistroRelease: Ubuntu 9.10
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  IpRoute:
   192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.65
   172.16.77.0/24 dev vmnet1  proto kernel  scope link  src 172.16.77.1
   172.16.158.0/24 dev vmnet8  proto kernel  scope link  src 172.16.158.1
   default via 192.168.1.254 dev wlan0
  NonfreeKernelModules: nvidia
  Package: network-manager 0.8~a~git.20091013t193206.679d548-0ubuntu1
  ProcEnviron:
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
  SourcePackage: network-manager
  Uname: Linux 2.6.31-16-generic x86_64

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