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[cascagrossa <1276238@xxxxxxxxxxxxxxxxxx>]

I have the same symptom, but with Broadcom wireless card and fresh
install of Kubuntu. Tried also Mint 17, same behavior.

ivan@cerebro:~$ uname -a
Linux cerebro 3.13.0-27-generic #50-Ubuntu SMP Thu May 15 18:06:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

ivan@cerebro:~$ cat /proc/version
Linux version 3.13.0-27-generic (buildd@akateko) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #50-Ubuntu SMP Thu May 15 18:06:16 UTC 2014

ivan@cerebro:~$ lspci | grep Network
12:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)

ivan@cerebro:~$ lsmod | grep wl
wl                   4207846  0 
lib80211               14381  2 wl,lib80211_crypt_tkip
cfg80211              484040  1 wl

The connection never drops when in use, no speed issues. But if I leave
the computer unattended for some time, ie no network traffic, the
connection drops and the system asks me the password to connect, but the
password is correctly configured so that if I cancel the dialog and
click on the link at nm-aplet(tray icon) it is reconnected without the
need to reenter the password.

It seems to me that has to do with network-manager because sometimes
there is a notification from the system that informs timeout of
autentication from wpa-suplicant.

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1276238

Title:
  Wifi Connection Dropping/Need to reconnect

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  While connected to wifi, my system will randomly drop the connection
  and ask me to reconnect.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-6-generic 3.13.0-6.23
  ProcVersionSignature: Ubuntu 3.13.0-6.23-generic 3.13.0
  Uname: Linux 3.13.0-6-generic x86_64
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jason      2254 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Feb  4 16:25:02 2014
  HibernationDevice: RESUME=UUID=60d68a6f-e268-441d-a7b9-8626d1521267
  InstallationDate: Installed on 2012-11-06 (455 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: LENOVO 4286CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-6-generic root=UUID=06af135e-53bd-4ecc-ba8a-471be159d14a ro quiet splash i915.semaphores=0 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-6-generic N/A
   linux-backports-modules-3.13.0-6-generic  N/A
   linux-firmware                            1.123
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-01-07 (27 days ago)
  dmi.bios.date: 12/01/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET56WW (1.26 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4286CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET56WW(1.26):bd12/01/2011:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4286CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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