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[Dennis-martin-herbers <1305857@xxxxxxxxxxxxxxxxxx>]

I tracked down the issue where WiFi would fail after suspend in that it
doesn't associate anymore (tries to connect but fails), and it's a bug
in wpa-supplicant that was fixed in the current version (Ubuntu uses
2.1, newest is 2.3). Replacing Ubuntu's wpa-supplicant 2.1 with Debian's
wpa-supplicant 2.3 and rebooting immediately fixed the issue.

https://packages.debian.org/sid/wpasupplicant

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https://bugs.launchpad.net/bugs/1305857

Title:
  wireless authentication always times out after standby

Status in wpasupplicant package in Ubuntu:
  Confirmed

Bug description:
  After updating from saucy to trusty, putting the system to standby
  makes wireless stop working after wake up. Rebooting the system fixes
  it until next time standby is entered.

  I've tried various hints about unloading modules, restarting the network-manager service or nm-applet, nmcli nm sleep false
  or using rfkill / the hardware kill switch. None of these changed the behaviour or seemed wrong. After following https://wiki.gnome.org/Projects/NetworkManager/Debugging, I was able to get the attached lines in /var/log/syslog.
  The driver works fine after wake up and scanning for networks works too. Upon trying authentication, the request fails after 5 seconds with a timeout. I managed to make the connection working again by killing wpa_supplicant so it must somehow be stuck.

  
  $ lsb_release -rd
  Description:	Ubuntu Trusty Tahr (development branch)
  Release:	14.04
  (current today, April 10th 2014)

  wpasupplicant version is 2.1-0ubuntu1

  System: Lenovo Thinkpad R61
  Wireless Driver: iwl3945
  $ uname -a
  Linux <hostname> 3.13.0-23-generic #45-Ubuntu SMP Fri Apr 4 06:58:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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