Return-path: Received: from server.heaven-czfree.net ([78.108.102.201]:55686 "EHLO mail.heaven-czfree.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751557Ab3EHHqY (ORCPT ); Wed, 8 May 2013 03:46:24 -0400 From: "Jaroslav Fojtik" To: linux-wireless-owner@vger.kernel.org, open80211s , linux-wirelss Date: Wed, 08 May 2013 09:24:52 +0200 MIME-Version: 1.0 Subject: ATH5k - wrong RSSI measurement on CM9 Message-ID: <5189FDC4.27244.7EAC862@jafojtik.seznam.cz> (sfid-20130508_094627_799016_3C5699FC) In-reply-to: <1367935076.8328.35.camel@jlt4.sipsolutions.net> References: <1367884164-15953-1-git-send-email-colleen@cozybit.com>, <1367935076.8328.35.camel@jlt4.sipsolutions.net> Content-type: text/plain; charset=US-ASCII Sender: linux-wireless-owner@vger.kernel.org List-ID: Dears, In Linux 2.6.22 the RSSI was measured properly for CM9 device. Afrer upgrading to 3.0.75, the RSSI measure is offseted. I even remember, that this problem has been introduced somewhere before 2.6.34. You could look at the following chart: http://78.108.103.11/cgi-bin/rodga_1month_big.cgi This is not signal drop, but a kernel change instead. (the chart is generated by parsing of iwconfig output: wlan1 IEEE 802.11abg ESSID:"dvrmn.heaven-czfree.net" Mode:Managed Frequency:5.64 GHz Access Point: 00:27:22:64:C3:02 Bit Rate=54 Mb/s Tx-Power=8 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=36/70 Signal level=-74 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:20 Invalid misc:59452 Missed beacon:0) I guess that this problem has been fixed one time and that there are two generations of CM9 devices that reports RSSI differently. best regards Jara