System stopped detecting wifi networks

Okay it's really weird, today suddenly my router stopped working (to be more specific, wifi stopped working, i didn't have time for further investigating).
I turned it off for about half hour and after turning it on again everything seemed to be okay, but my system stopped seeing most of networks (including my home network).
I did little investigation and my smartphone, notebook and even windows on the same machine, all of them see all networks and can connect to my home network, so it's propably not router's fault.
My wifi card is TP-Link W851ND (and as mentioned above, on windows everything works great so i guess it's something with linux).
I'm using Cinnamon so i'm connecting via networkmanager (but iw .. scan also sees only few networks).
I thought that maybe newer version of some package may be guilty (i ran system upgrade in meantime) but i downgraded all affected packages and nothing changed.
I'm stuck, any ideas what might cause the problem?
Last edited by smiechowy (2014-07-06 20:19:10)

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copied from Apple - Support - Service Answer Center

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