Return-path: Received: from mailout03.t-online.de ([194.25.134.81]:37289 "EHLO mailout03.t-online.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755904Ab1FJSY7 (ORCPT ); Fri, 10 Jun 2011 14:24:59 -0400 Message-ID: <4DF26175.2010506@t-online.de> (sfid-20110610_202502_139360_FEB5B52B) Date: Fri, 10 Jun 2011 20:24:53 +0200 From: =?UTF-8?B?UmljaGFyZCBTY2jDvHR6?= MIME-Version: 1.0 To: "Guy, Wey-Yi" CC: Stevie Trujillo , "linux-wireless@vger.kernel.org" Subject: Re: iwlagn: is tx_power_device_lmt a regulatory limit or a hardware limit? References: <201105251813.36804.stevie.trujillo@gmail.com> <1306352560.20732.0.camel@wwguy-ubuntu> <201105252154.06204.stevie.trujillo@gmail.com> <1306376938.20732.2.camel@wwguy-ubuntu> <4DDE1458.9090004@t-online.de> <1306419109.20732.6.camel@wwguy-ubuntu> <4DF246D1.9000107@t-online.de> <1307727083.13397.57.camel@wwguy-huron> In-Reply-To: <1307727083.13397.57.camel@wwguy-huron> Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: Am 10.06.2011 19:31, schrieb Guy, Wey-Yi: > On Fri, 2011-06-10 at 09:31 -0700, Richard Schütz wrote: >> On 26.05.2011 16:11, wwguy wrote: >>> On Thu, 2011-05-26 at 01:50 -0700, Richard Schütz wrote: >>>>> On Wed, 2011-05-25 at 12:54 -0700, Stevie Trujillo wrote: >>>>>> On Wednesday 25 May 2011 21:42:40 wwguy wrote: >>>>>>> On Wed, 2011-05-25 at 09:13 -0700, Stevie Trujillo wrote: >>>>>>>> Hello, >>>>>>>> >>>>>>>> I have a "Intel(R) Centrino(R) 1030 BGN" card. tx_power_device_lmt is 15 >>>>>>>> and I was wondering if the card could do more than that. >>>>>>> >>>>>>> the card should not and will not do more than what required by >>>>>>> regulatory >>>>>> >>>>>> I'm allowed to do 20dBm here and was wondering if I could make the card do >>>>>> that. >>>>>> >>>>> the tx power in Intel WiFi device is regulated by uCode to make sure we >>>>> are within regulatory limits. What country you are in? >>>>> >>>>> Thanks >>>>> Wey >>>> >>>> I am also having the same issue with my Intel PRO/Wireless 5100 AGN. >>>> Here in Germany I'm allowed to use 20 dBm (in the 2.4 GHz band), but the >>>> card is limited to 15 dBm. So in some situations other cards are working >>>> fine (as they use 20 dBm) and the Intel can't establish a connection. >>>> >>> We do not have different SKUs for different regions of the world. Now I >>> understand your problem. Thank you very much for reporting. I will raise >>> the issue and see how we should fix it. >>> >>> Sorry, I don't have a solution for you today. But it is very important >>> for us and we need to result it. >>> >>> Thanks >>> Wey >> >> Is there any news? >> > Hi, I talk to the marketing and since we are providing single SKU > solution, the maximum allowed tx power is programmed in EEPROM, so > currently there is no method to allow use the higher limitation. > > Thanks > Wey According to [1] there are no countries that forbid tx power values lower than 20dBm in the 2.4 GHz band. The lowest value for the 5 GHz band listed is 17 dBm. So why are the Intel cards limited to 15dBm then for both bands? This value absolutely makes no sense in my view. [1] http://git.kernel.org/?p=linux/kernel/git/linville/wireless-regdb.git;a=blob;f=db.txt;hb=HEAD -- Regards, Richard Schütz