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Subject: Re: Setting txpower fails?
From: Bruno Antunes <baantunes@gmail.com>
In-Reply-To: <53358920.6030304@candelatech.com>
Date: Fri, 28 Mar 2014 14:49:58 +0000
Cc: linux-wireless@vger.kernel.org, sedat.dilek@gmail.com
Message-Id: <8BD1BFE8-263F-4EDC-8044-30F4FBC44041@gmail.com> (sfid-20140328_155007_819287_01307E54)
References: <5334F8E7.1070803@candelatech.com> <CA+icZUVe7Mwf2P=Jk3rHvqZEDf3otOP7DwM=y7_LVHd4t_koQA@mail.gmail.com> <533584BF.70604@candelatech.com> <4CC49FDB-1767-4A3F-9C1D-8F8DCF612233@gmail.com> <53358920.6030304@candelatech.com>
To: Ben Greear <greearb@candelatech.com>
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On 28 Mar, 2014, at 14:37 , Ben Greear <greearb@candelatech.com> wrote:

> On 03/28/2014 07:29 AM, Bruno Antunes wrote:
>> Hi Ben,
>> I think you are missing some parameters
>> 
>> On 28 Mar, 2014, at 14:18 , Ben Greear <greearb@candelatech.com> wrote:
>> 
>>> On 03/28/2014 12:27 AM, Sedat Dilek wrote:
>>>> On Fri, Mar 28, 2014 at 5:21 AM, Ben Greear <greearb@candelatech.com> wrote:
>>>>> Any idea why this isn't working?
>>>>> 
>>>>> Kernel is 3.9.11+, driver is ath9k.
>>>>> 
>>>>> [root@ct523-9292 lanforge]# iwconfig wlan0
>>>>> wlan0     IEEE 802.11abgn  ESSID:off/any
>>>>>           Mode:Managed  Access Point: Not-Associated   Tx-Power=16 dBm
>>>>>           Retry short limit:7   RTS thr:off   Fragment thr:off
>>>>>           Encryption key:off
>>>>>           Power Management:off
>>>>> 
>>>>> [root@ct523-9292 lanforge]# iwconfig wlan0 txpower 10
>> 
>> iw dev <devname> set txpower <auto|fixed|limit> [<tx power in mBm>]
>> 
>>  It should be something like:
>> 
>> iw dev wlan0 set txpower fixed 1000
> 
> Ok, that doesn't give an error, but 'iwconfig' still shows 16 dBm,
> and I don't see any way to get 'iw' to print out the power itself?
> 
> So, not sure if it is really working or not.
It works , at least on iw 3.10.

If you have debug enabled you can see the value changing.

On a openwrt system

root@RSPro2:/lib/wifi#  iw dev adhoc0 set txpower fixed 900
root@RSPro2:/lib/wifi# cat /sys/kernel/debug/ieee80211/phy0/netdev:adhoc0/txpower
9
root@RSPro2:/lib/wifi#  iw dev adhoc0 set txpower fixed 1500
root@RSPro2:/lib/wifi# cat /sys/kernel/debug/ieee80211/phy0/netdev:adhoc0/txpower
15

And the received power changes on the station confirming that is making effect.

Bruno

> 
> Thanks,
> Ben
> 
> 
> -- 
> Ben Greear <greearb@candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>