Unable to set txpower on wifi card - SOLVED
JD
jd1008 at gmail.com
Mon Aug 30 21:37:23 UTC 2010
A patch was submitted on Aug 25th, 2010 and integrated in 2.6.36.
Google the exact phrase "rt2x00: Fix max TX power settings"
so, it will be quiet a while before a fedora kernel package sees it.
On 08/30/2010 02:22 PM, JB wrote:
> JD<jd1008<at> gmail.com> writes:
>
>> 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?
>>
> Hi,
> $ man iwconfig
> ...
> txpower
> ...
> In addition, on and off enable and disable the radio, and auto
> and fixed enable and disable power control (if those features
> are available).
> ...
> iwconfig eth0 txpower auto
>
> $ sudo iwconfig wlan0
> ...
> Bit Rate=54 Mb/s Tx-Power=8 dBm<<<=====
> ...
>
> The Tx-Power=8 dBm
> means "fixed" power control (as opposite to "auto").
> JB
>
>
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