Return-path: Received: from mail-we0-f174.google.com ([74.125.82.174]:33072 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751038Ab2AKXHz (ORCPT ); Wed, 11 Jan 2012 18:07:55 -0500 Received: by werm1 with SMTP id m1so937886wer.19 for ; Wed, 11 Jan 2012 15:07:54 -0800 (PST) MIME-Version: 1.0 Date: Wed, 11 Jan 2012 17:07:54 -0600 Message-ID: (sfid-20120112_000758_732655_A25408AB) Subject: carl9170: How to control transmit power? From: Harshal Chhaya To: linux-wireless Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hello, Does the carl9170 driver/firmware allow real-time updates to the tx power parameter? On my AR9170-based AP, I can't set the tx power using either 'iw' or 'iwconfig'. 'iw' fails with an error message: root@OpenWrt:/etc/hostapd# iw wlan0 set txpower fixed 10 command failed: Operation not supported (-95) 'iwconfig' seems to update the information that's displayed but it doesn't affect the actual tx power root@OpenWrt:/# iwconfig wlan0 wlan0 IEEE 802.11bgn Mode:Master Frequency:2.412 GHz Tx-Power=7 dBm RTS thr:off Fragment thr:off Power Management:off root@OpenWrt:/# iwconfig wlan0 txpower 11 root@OpenWrt:/# iwconfig wlan0 wlan0 IEEE 802.11bgn Mode:Master Frequency:2.412 GHz Tx-Power=11 dBm RTS thr:off Fragment thr:off Power Management:off Is there another way to set the tx power? I want to reduce the range of my AP and am trying to lower the tx power. Thanks, - Harshal