Return-path: Received: from mail-bn1lp0156.outbound.protection.outlook.com ([207.46.163.156]:13912 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751316Ab3IMRLd convert rfc822-to-8bit (ORCPT ); Fri, 13 Sep 2013 13:11:33 -0400 From: Albert Lo To: "linux-wireless@vger.kernel.org" Subject: problems setting the channel Date: Fri, 13 Sep 2013 17:11:28 +0000 Message-ID: (sfid-20130913_191136_591499_66171A47) Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hello, Forgive the newbie question, but I'm having a hard time setting the channel. Here is my output: ====================================== root@OpenWrt:~# iw dev wlan0 info Interface wlan0 ifindex 7 wdev 0x2 addr 04:f0:21:01:1b:91 type AP wiphy 0 channel 11 (2462 MHz) NO HT root@OpenWrt:~# iw reg get country US: (2402 - 2472 @ 40), (3, 27) (5170 - 5250 @ 40), (3, 17) (5250 - 5330 @ 40), (3, 20), DFS (5490 - 5600 @ 40), (3, 20), DFS (5650 - 5710 @ 40), (3, 20), DFS (5735 - 5835 @ 40), (3, 30) root@OpenWrt:/# iw dev wlan0 set channel 10 root@OpenWrt:/# iw dev wlan0 set channel 19 command failed: Invalid argument (-22) ================================================== Any ideas why setting channel to 10 is ok, but setting channel to 19 fails? I do notice that my phy is split into two parts, Band1 and Band2. ================================================== root@OpenWrt:~# iw phy phy0 info Wiphy phy0 Band 1: Capabilities: 0x11ce HT20/HT40 SM Power Save disabled RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 3839 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 8 usec (0x06) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 2412 MHz [1] (27.0 dBm) * 2417 MHz [2] (27.0 dBm) * 2422 MHz [3] (27.0 dBm) * 2427 MHz [4] (27.0 dBm) * 2432 MHz [5] (27.0 dBm) * 2437 MHz [6] (27.0 dBm) * 2442 MHz [7] (27.0 dBm) * 2447 MHz [8] (27.0 dBm) * 2452 MHz [9] (27.0 dBm) * 2457 MHz [10] (27.0 dBm) * 2462 MHz [11] (27.0 dBm) * 2467 MHz [12] (disabled) * 2472 MHz [13] (disabled) * 2484 MHz [14] (disabled) Bitrates (non-HT): * 1.0 Mbps * 2.0 Mbps (short preamble supported) * 5.5 Mbps (short preamble supported) * 11.0 Mbps (short preamble supported) * 6.0 Mbps * 9.0 Mbps * 12.0 Mbps * 18.0 Mbps * 24.0 Mbps * 36.0 Mbps * 48.0 Mbps * 54.0 Mbps Band 2: Capabilities: 0x11ce HT20/HT40 SM Power Save disabled RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 3839 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 8 usec (0x06) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 5180 MHz [36] (17.0 dBm) * 5200 MHz [40] (17.0 dBm) * 5220 MHz [44] (17.0 dBm) * 5240 MHz [48] (17.0 dBm) * 5260 MHz [52] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5280 MHz [56] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5300 MHz [60] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5320 MHz [64] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5500 MHz [100] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5520 MHz [104] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5540 MHz [108] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5560 MHz [112] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5580 MHz [116] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5600 MHz [120] (disabled) * 5620 MHz [124] (disabled) * 5640 MHz [128] (disabled) * 5660 MHz [132] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5680 MHz [136] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5700 MHz [140] (20.0 dBm) (passive scanning, no IBSS, radar detection) * 5745 MHz [149] (30.0 dBm) * 5765 MHz [153] (30.0 dBm) * 5785 MHz [157] (30.0 dBm) * 5805 MHz [161] (30.0 dBm) * 5825 MHz [165] (30.0 dBm) Bitrates (non-HT): * 6.0 Mbps * 9.0 Mbps * 12.0 Mbps * 18.0 Mbps * 24.0 Mbps * 36.0 Mbps * 48.0 Mbps * 54.0 Mbps ....... Any ideas as to how I can set wlan0 to the channels in Band2? Best Regards, Albert