wi-fi continually fails to connect (after previous success)

[Roger Peppe]

Wi-fi had been working fine, but this morning, nothing doing.

syslog shows many instances of:

<warn> Activation (wlan0/wireless): association took too long, failing activation.

Some info which may or may not be relevant:

Removing the network and adding it made no difference.
Deactivating, then reactivating the hardware wi-fi network switch made no difference.
This was happening on two independent wi-fi networks (my hotel and the bluefin office)
Rebooting fixed the issue.
Closing the laptop did not reliably send it to sleep last night.
Two competent Canonical engineers were unable to diagnose the problem.

% lsb_release -rd
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
% uname -a
Linux rog-ThinkPad-X220 3.13.0-2-generic #17-Ubuntu SMP Fri Jan 10 12:14:30 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
% lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM67 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000 [Condor Peak]
0d:00.0 System peripheral: Ricoh Co Ltd MMC/SD Host Controller (rev 07)
%

I have attached my syslog starting just before the most recent successful connection until
just before I rebooted.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Simon Déziel (sdeziel)]

I have a similar issue and removing/inserting the module fixes the problem in my case.

[Henrique Gogó (gogs)]

I have this issue too, but when I turn off and on the wireless adapter, fixes the problem

[Henrique Gogó (gogs)]

I disabled the bluetooth adapter, so my wifi connection became stable. I think what is doing maybe is some interference by bluetooth driver with wifi, or something like this.

[Rolf Leggewie (r0lf)]

Is this still a problem on bionic or later?

[Launchpad Janitor (janitor)]

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