Return-path: Received: from mail-oa0-f53.google.com ([209.85.219.53]:60284 "EHLO mail-oa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755920AbaGNRPa convert rfc822-to-8bit (ORCPT ); Mon, 14 Jul 2014 13:15:30 -0400 Received: by mail-oa0-f53.google.com with SMTP id j17so1726331oag.26 for ; Mon, 14 Jul 2014 10:15:30 -0700 (PDT) MIME-Version: 1.0 Date: Mon, 14 Jul 2014 19:15:29 +0200 Message-ID: (sfid-20140714_191538_486517_7AA0F196) Subject: Setting TX power with nl80211 while being *not* connected From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= To: "linux-wireless@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: I've noticed that setting TX power, e.g with: iw dev wlp2s0 set txpower fixed 1200 has no effect if I'm disconnected. As soon as I connect to some network .config gets called, it has IEEE80211_CONF_CHANGE_POWER set and power_level is set to "12". I've quickly tested this and it seems that __ieee80211_recalc_txpower returns false if I'm not connected (rcu_dereference(sdata->vif.chanctx_conf) returns NULL). Is that expected? Is there any way to limit TX power for scanning purposes? -- Rafał