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[Tessa Lau <tlau@xxxxxxxx>]

I have a similar symptom although I don't know if it's for the same
cause. My wireless connection will drop (disconnected from the access
point) and never reconnect unless I manually ifdown/ifup the interface.
I'm using wpa_supplicant but since this is a headless server, I'm not
using Network Manager.

Ubuntu Server 14.04.3 LTS.
Network controller: Qualcomm Atheros AR928X Wireless Network Adapter (PCI-Express) (rev 01)

The syslog when this happens looks like this:

Dec 11 22:52:48 beta3 kernel: [393250.537636] wlan0: deauthenticated from 8a:15:04:97:42:01 (Reason: 7)
Dec 11 22:52:48 beta3 wpa_supplicant[1017]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8a:15:04:97:42:01 reason=7
Dec 11 22:52:48 beta3 wpa_supplicant[1017]: wlan0: SME: Trying to authenticate with 8a:15:04:97:42:01 (SSID='savioke' freq=2412 MHz)
Dec 11 22:52:48 beta3 kernel: [393250.589435] cfg80211: Calling CRDA to update world regulatory domain
Dec 11 22:52:48 beta3 wpa_supplicant[1017]: wlan0: CTRL-EVENT-SCAN-STARTED 
Dec 11 22:52:48 beta3 kernel: [393250.601392] cfg80211: World regulatory domain updated:
Dec 11 22:52:48 beta3 kernel: [393250.601396] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Dec 11 22:52:48 beta3 kernel: [393250.601398] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 11 22:52:48 beta3 kernel: [393250.601399] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 11 22:52:48 beta3 kernel: [393250.601401] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
Dec 11 22:52:48 beta3 kernel: [393250.601402] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Dec 11 22:52:48 beta3 kernel: [393250.601403] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)

After this point the wireless connection never comes up until I manually
ifdown/ifup the interface.

I've tried setting the regulatory domain and disabling ipv6 as described
in http://askubuntu.com/questions/465848/frequent-deauthentication-from-
wifi-reason-6-in-a-centrino-advanced-n-6230-r . My atheros card doesn't
have an option to disable 802.11n ( http://askubuntu.com/questions/18897
/enable-only-802-11b-g-in-a-802-11n-in-atheros-wireless-card ).

Should I create a new issue or is this similar enough to the OP's issue?

-- 
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Packages, which is subscribed to wpa in Ubuntu.
https://bugs.launchpad.net/bugs/1399888

Title:
  Wireless network connection terminates and won't reconnect

Status in wpa package in Ubuntu:
  Confirmed

Bug description:
  On: Linux x 3.16.0-25-generic #33-Ubuntu SMP Tue Nov 4 12:06:54 UTC
  2014 x86_64 x86_64 x86_64 GNU/Linux

  Wireless connections terminate without obvious reason. A reconnect is
  not possible.

  Every now and then (every second day) the network connection drops.
  The network indicator shows no signal strenght (empty icon)

  The correct connection is selected, a wealth of other SSIDs are in the
  list.

  A reconnect opens up the password dialog (which is an indication that the old error was reintroduced into the code).
  I reported this bug several times. The reason at the time was that reconnection would try to fetch the encrypted password and reencrypt it leading to a wrong password.

  There is a workaround:
  Disabling and Enabling the network connection reconnects correctly. In the code (as I analyzed then), this is due to the fact that the password from searing is taken as is and forwarded to the authentication code (not reencrypted). The connection gets established again.

  This issue did not occur in 12.04 and 12.10 (due to less connection
  problems or due to a fix is beyond me, I simple confirmed there were
  no connection aborts). It reappeared in 13.x and now is back as an
  annoyance.

  The error numbers then were around 460.000 - 490.000 as far is I
  remember (I have deleted bug reports I considered solved).

  I observed this issue on any Ubuntu machine. I also observed that the
  list of SSIDs is extremely long when this incident arises (approx. 15
  - 20). Maybe a storm of SSID broadcasts is the basic cause but I have
  not done any research beyond what I described here.

  Hope this gets fixed for good now.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: wpasupplicant 2.1-0ubuntu4
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Dec  6 10:27:42 2014
  InstallationDate: Installed on 2013-05-17 (567 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64+mac (20130424)
  SourcePackage: wpa
  UpgradeStatus: No upgrade log present (probably fresh install)

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