From: Sujith Manoharan <sujith@msujith.org>
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Date: Mon, 23 Feb 2015 11:16:20 +0530
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Adrian Chadd <adrian@freebsd.org>,
	"ath9k-devel\@lists.ath9k.org" <ath9k-devel@lists.ath9k.org>,
	Linux Wireless List <linux-wireless@vger.kernel.org>,
	Kalle Valo <kvalo@codeaurora.org>,
	"Luis R. Rodriguez" <mcgrof@do-not-panic.com>
Subject: Re: [ath9k-devel] AR9462 problems connecting again..
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Sender: linux-wireless-owner@vger.kernel.org

Linus Torvalds wrote:
> 14:07:23.542927: wlp1s0: Event DEAUTH (12) received
> 14:07:23.542946: wlp1s0: Deauthentication notification
> 14:07:23.542964: wlp1s0:  * reason 2
> 14:07:23.542982: wlp1s0:  * address 20:9f:db:e7:80:80
> 14:07:23.542997: Deauthentication frame IE(s) - hexdump(len=0): [NULL]
> 14:07:23.543055: wlp1s0: CTRL-EVENT-DISCONNECTED bssid=20:9f:db:e7:80:80 reason=2

Sporadic association problems could be a problem with the chosen rates.
This would show the rates for the EAPOL frames:

iw dev wlp1s0 interface add mon0 type monitor
ifconfig mon0 up
tshark -i mon0 -Y eapol -T fields -e radiotap.datarate -e wlan -e eapol -e wlan.sa -e wlan.da
Run wpa_s.

Does setting a lower rate improve connectivity ?

'iw dev wlp1s0 set bitrates ht-mcs-2.4 1' would choose a lower
rate for the key-exchange frames.

Sujith