Re: Unable to set txpower on wifi card

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  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?

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