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I have a Dell Inspiron 5520 laptop with an Intel Centrino Wireless-N 2230 card, running Ubuntu 14.04. The wifi worked flawlessly with my old Virgin Media Superhub, but after being "upgraded" to a Superhub 2, the laptop usually fails to reconnect to the network after I suspend it - all my other devices work fine, though it's the only one in the house running Linux. The laptop can always see the network, it just takes ages trying to connect after being suspended and eventually gives up - dmesg shows some "authentication timed out" errors.

I have tried two different USB wifi adapters that work perfectly on a Windows desktop, and both exhibit the same problem on the laptop. The only workarounds I have found so far are to reboot the laptop or hub, change the wifi channel, or disable wifi security. I've tried restarting network-manager, deleting the connection from the manager, and turning the wireless card off and on with the button on the keyboard - none of these seem to help. I've tried all the suggestions on this thread and this one (though their issues seem very slightly different), and none have any effect, except that sudo modprobe -r iwlwifi gives me an error:

modprobe: FATAL: Module mac80211 is in use.
modprobe: FATAL: Error running remove command for iwlwifi.

Does anyone have any ideas as to what to try next? I'd be very happy with a more convenient workaround if I can't find a permanent solution.

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I have a very similar problem, the workaround which works for me is to kill wpa_supplicant and then suspend again. Once it is woken up again, WiFi works. –  kasperd Aug 12 at 7:54

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I'm having this same issue. Seems to only happen to me when using the Superhub as well. When suspending/resuming elsewhere (using different wireless routers) I do not have this issue.

The (annoying) workaround for me has also been to switch between the channels but this does not always work either. This is assuming that your Virgin Superhub also has 2 separate connections for 2G and 5G?

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Welcome to askubuntu. This does not seem to be an answer to the original question. Please use the comment function (once you have sufficient reputation) to add or ask for additional information. As it stands your post only confirms the information already in the question. –  Adaephon Aug 12 at 7:41

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