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[Mathieu Trudel-Lapierre <mathieu.tl@xxxxxxxxx>]

I see lots of these messages:

Nov 19 08:03:43 ubuntu-phablet NetworkManager[1448]: <warn> Activation (wlan0/wireless): association took too long, failing activation.
Nov 19 08:03:43 ubuntu-phablet NetworkManager[1448]: <info> (wlan0): device state change: config -> failed (reason 'SSID not found') [50 120 53]
Nov 19 08:03:43 ubuntu-phablet NetworkManager[1448]: <info> NetworkManager state is now DISCONNECTED
Nov 19 08:03:43 ubuntu-phablet NetworkManager[1448]: <warn> Activation (wlan0) failed for connection 'Canonical-5GHz-an'
Nov 19 08:03:43 ubuntu-phablet NetworkManager[1448]: <info> (wlan0): device state change: failed -> disconnected (reason 'none') [120 30 0]
Nov 19 08:03:43 ubuntu-phablet NetworkManager[1448]: <info> (wlan0): deactivating device (reason 'none') [0]
Nov 19 08:03:43 ubuntu-phablet kernel: [51481.120852] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2908: 11d AP Bssid 84:18:3a:44:da:ec chan= 36, rssi = -50, countryCode US
Nov 19 08:03:43 ubuntu-phablet kernel: [51481.121920] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2908: 11d AP Bssid 84:18:3a:44:da:e8 chan= 8, rssi = -40, countryCode US
Nov 19 08:03:43 ubuntu-phablet kernel: [51481.122835] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2928: Information about current country Bssid 84:18:3a:04:da:e8 chan= 8, rssi = -40, countryCode US
Nov 19 08:03:43 ubuntu-phablet wpa_supplicant[1828]: wlan0: Failed to initiate sched scan
Nov 19 08:03:43 ubuntu-phablet wpa_supplicant[1828]: wlan0: CTRL-EVENT-SCAN-STARTED 
Nov 19 08:03:44 ubuntu-phablet kernel: [51482.020195] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2908: 11d AP Bssid 84:18:3a:08:65:b8 chan= 4, rssi = -84, countryCode US
Nov 19 08:03:44 ubuntu-phablet kernel: [51482.021142] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2908: 11d AP Bssid 84:18:3a:44:da:ec chan= 36, rssi = -50, countryCode US
Nov 19 08:03:44 ubuntu-phablet kernel: [51482.021935] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2908: 11d AP Bssid 84:18:3a:44:da:e8 chan= 8, rssi = -38, countryCode US
Nov 19 08:03:44 ubuntu-phablet kernel: [51482.022912] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2908: 11d AP Bssid 84:18:3a:04:da:e8 chan= 8, rssi = -37, countryCode US
Nov 19 08:03:44 ubuntu-phablet kernel: [51482.023614] wlan: [1317:E :SME] csrMoveTempScanResultsToMainList: 2928: Information about current country Bssid 84:18:3a:04:da:e8 chan= 8, rssi = -37, countryCode US
Nov 19 08:03:45 ubuntu-phablet NetworkManager[1448]: <info> (wlan0): supplicant interface state: scanning -> disconnected
Nov 19 08:03:45 ubuntu-phablet NetworkManager[1448]: <warn> Couldn't disconnect supplicant interface: This interface is not connected

It tells me you're likely just outside of the range of the accesspoints,
and since it comes in and out of scan results regularly, NM will keep
trying to authenticate while the AP is available.

A couple of things to try:
 - Switch to 2.4GHz, see if the behavior is the same, this could give us some interesting data points.
 - Disable location, which causes significantly more wifi scans to be triggered, and reducing that may also improve the situation.
 - Try to attach strace to NetworkManager and/or dbus-daemon, this would let us see what they are spinning at when they are consuming lots of CPU (as per the report).

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

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https://bugs.launchpad.net/bugs/1394204

Title:
  dbus daemon spinning with NM AP properties change event

Status in “network-manager-applet” package in Ubuntu:
  Incomplete

Bug description:
  I am consistently seeing this in the Bluefin office this week
  Mako running 133

  Phone gets warm in pocket, wake up the phone and attach
  top shows dbus-daemon at 100%+ cpu and network-manager next at 10-20%
  It never quiets own, at least not for over 5 mins

  3g data is turned off
  Cellular is roaming to local carrier fwiw
  Seems to happen whenever I leave the AP coverage, whether I return or not

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