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[Launchpad Bug Tracker <1315470@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1315470

Title:
  wlan0 gets disconnected randomly and can not reconnect

Status in linux package in Ubuntu:
  Expired

Bug description:
  At random times, several time sper day after upgrade from 13.10 to 14.04, my wireless connection gets disconnected and the system log shows:
  May  2 13:17:01 Baba-Yaga CRON[18205]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
  May  2 13:40:03 Baba-Yaga wpa_supplicant[1553]: wlan0: CTRL-EVENT-DISCONNECTED bssid=d4:ca:6d:57:91:d1 reason=0
  May  2 13:40:03 Baba-Yaga NetworkManager[1200]: <info> (wlan0): roamed from BSSID D4:CA:6D:57:91:D1 (Host) to (none) ((none))
  May  2 13:40:03 Baba-Yaga NetworkManager[1200]: <info> (wlan0): supplicant interface state: completed -> disconnected
  May  2 13:40:03 Baba-Yaga wpa_supplicant[1553]: wlan0: Reject scan trigger since one is already pending
  May  2 13:40:03 Baba-Yaga wpa_supplicant[1553]: wlan0: Failed to initiate AP scan

  At this point, I will never be able to reconnect to the access point
  and after several attempts, the wirless connection is removed from the
  NetworkManager applet and the only way to get the wirless connection
  back, is to shut down the machine, turn it back on and let it boot.
  Just doing a warm reboot will not resolve the issue in many cases. A
  cold reboot always will.

  This is a Realtek USB based WiFi device and I have used it now for a
  few years without issues. Moving the WiFi device to a Windows PC shows
  that it works as intended and is never disconnecting or losing
  connection in any way.

  lsusb shows:
  Bus 001 Device 005: ID 0bda:8171 Realtek Semiconductor Corp. RTL8188SU 802.11n WLAN Adapter

  $ lsb_release -rd
  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  $ uname -a
  Linux Baba-Yaga 3.14.0-031400-generic #201403310035 SMP Mon Mar 31 04:36:23 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  Same issue is also present with the default 3.13 kernel.

  $ apt-cache policy network-manager
  network-manager:
    Installed: 0.9.8.8-0ubuntu7
    Candidate: 0.9.8.8-0ubuntu7
    Version table:
   *** 0.9.8.8-0ubuntu7 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: network-manager 0.9.8.8-0ubuntu7
  Uname: Linux 3.14.0-031400-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  Date: Fri May  2 14:04:32 2014
  EcryptfsInUse: Yes
  ExecutablePath: /usr/sbin/NetworkManager
  InstallationDate: Installed on 2014-04-26 (5 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  IpRoute:
   default via 192.168.100.1 dev wlan0  proto static 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   169.254.136.0/24 dev eth0  proto kernel  scope link  src 169.254.136.2 
   192.168.100.0/24 dev wlan0  proto kernel  scope link  src 192.168.100.162  metric 9
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  RfKill:
   
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
   Suburban                  069407c8-4892-4a35-ae60-67471e4b941c   802-11-wireless   1399053730   Fri 02 May 2014 02:02:10 PM EDT    yes           no         /org/freedesktop/NetworkManager/Settings/1
   Auto Suburban 1           31b75b94-c201-404c-9b8a-38a3d63fd032   802-11-wireless   0            never                              yes           no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   eth0       802-3-ethernet    unmanaged     /org/freedesktop/NetworkManager/Devices/1  
   wlan0      802-11-wireless   connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
   running         0.9.8.8    connected       enabled       enabled         enabled    enabled         disabled

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