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Message-ID: <53359475.60904@candelatech.com> (sfid-20140328_162554_300021_0BC9F850)
Date: Fri, 28 Mar 2014 08:25:41 -0700
From: Ben Greear <greearb@candelatech.com>
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To: Bruno Antunes <baantunes@gmail.com>
CC: linux-wireless@vger.kernel.org, sedat.dilek@gmail.com
Subject: Re: Setting txpower fails?
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On 03/28/2014 08:15 AM, Bruno Antunes wrote:
>
> On 28 Mar, 2014, at 15:02 , Ben Greear <greearb@candelatech.com> wrote:
>
>> On 03/28/2014 07:49 AM, Bruno Antunes wrote:
>>>
>>> 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.
>>
>> Just for posterity's sake, it seems you should really be looking
>> at user_power_level:
>>
>> [root@ct523-9292 lanforge]# iw dev wlan0 set txpower fixed 1000
>> [root@ct523-9292 lanforge]# cat /debug/ieee80211/wiphy0/netdev\:wlan0/txpower
>> 0
>> [root@ct523-9292 lanforge]#
>>
>> [root@ct523-9292 lanforge]# cat /debug/ieee80211/wiphy0/netdev\:wlan0/user_power_level
>> 10
>>
> Not on all systems...

I suspect the difference is that my wlan0 is not actually connected,
and it will probably show correct 'txpower' when it is connected.

Thanks,
Ben

>
> root@RSPro2:/etc/config#  iw dev adhoc0 set txpower fixed 700
> root@RSPro2:/etc/config# cat /sys/kernel/debug/ieee80211/phy0/netdev\:adhoc0/txpower
> 7
> root@RSPro2:/etc/config# cat /sys/kernel/debug/ieee80211/phy0/netdev\:adhoc0/user_power_level
> 7
>
> Bruno
>
>> Thanks,
>> Ben
>>
>>>
>>> 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
>>>>
>>
>>
>> --
>> Ben Greear <greearb@candelatech.com>
>> Candela Technologies Inc  http://www.candelatech.com
>>


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