Re: Unable to set txpower on wifi card

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  On 08/30/2010 12:28 PM, Terry Polzin wrote:
> On Mon, 2010-08-30 at 11:45 -0700, JD wrote:
>> On 08/30/2010 11:32 AM, Rick Stevens wrote:
>>> On 08/30/2010 10:41 AM, JD wrote:
>>>>      F13, latest updates.
>>>> wifi card: Sparklan wmir-200N
>>>> http://www.sparklan.com/product.php?func=view&prod_id=43
>>>> Chipset: RT2860/RT2850
>>>>
>>>> The Datasheet says:
>>>>
>>>> Output Power
>>>> 802.11a: 12.5dBm ± 1.5dBm
>>>> 802.11b: 17dBm ± 1.5dBm
>>>> 802.11g: 14dBm ± 1.5dBm
>>>> 802.11an: 14dBm ± 1.5dBm
>>>> 802.11gn: 14dBm ± 1.5dBm
>>>>
>>>> I am running in g mode (54megabits/s)
>>>>
>>>> $ sudo iwconfig wlan0
>>>> wlan0     IEEE 802.11abgn  ESSID:"Deleted"
>>>>               Mode:Managed  Frequency:2.462 GHz  Access Point:
>>>> aa:bb:cc:dd:ee:ff
>>>>               Bit Rate=54 Mb/s   Tx-Power=8 dBm<<<=====
>>>>               Retry  long limit:7   RTS thr:off   Fragment thr:off
>>>>               Encryption key:off
>>>>               Power Management:on
>>>>               Link Quality=70/70  Signal level=58 dBm
>>>>               Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>>>>               Tx excessive retries:0  Invalid misc:0   Missed beacon:0
>>>>
>>>> I tried to set txpower to 14 per datasheet spec:
>>>>
>>>> $ sudo iwconfig wlan0 txpower 14dBm
>>>> Error for wireless request "Set Tx Power" (8B26) :
>>>>         SET failed on device wlan0 ; Invalid argument.
>>>>
>>>> The drivers that are loaded for this wifi card are:
>>>>
>>>> rt2800pci               7931  0
>>>> rt2800lib              27818  1 rt2800pci
>>>> rt2x00pci               5799  1 rt2800pci
>>>> rt2x00lib              25936  3 rt2800pci,rt2800lib,rt2x00pci
>>>> mac80211              182154  2 rt2x00pci,rt2x00lib
>>>> cfg80211              135626  2 rt2x00lib,mac80211
>>>> eeprom_93cx6            1305  1 rt2800pci
>>>> crc_ccitt               1311  2 rt2800pci,irda
>>>>
>>>> Is this an issue with the wext driver or with the rt2XXXXX drivers?
>>> Try "sudo iwconfig wlan0 txpower 14".  The "dBm" is assumed by the
>>> command.  "man iwconfig" for details.
>>> ----------------------------------------------------------------------
>>> - Rick Stevens, Systems Engineer, C2 Hosting          ricks@xxxxxxxx -
>>> - AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
>>> -                                                                    -
>>> -           Vegetarian:  Old Indian word for "lousy hunter"          -
>>> ----------------------------------------------------------------------
>> Did not work :(
>>
>> $ sudo iwconfig wlan0 txpower 14
>> Error for wireless request "Set Tx Power" (8B26) :
>>       SET failed on device wlan0 ; Invalid argument.
>>
>> But setting it to 8 worked. So, why does it reject what the specs say is
>> legit power setting?
>>
> How about 9?
> Maybe they want the value in hex?
>
>
Tried that too. Same error:

$ sudo iwconfig wlan0 txpower 9
Error for wireless request "Set Tx Power" (8B26) :
     SET failed on device wlan0 ; Invalid argument.
$ sudo iwconfig wlan0 txpower 0x9
Error for wireless request "Set Tx Power" (8B26) :
     SET failed on device wlan0 ; Invalid argument.

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