Unable to set txpower on wifi card

JD jd1008 at gmail.com
Mon Aug 30 17:41:24 UTC 2010

  F13, latest updates.
wifi card: Sparklan wmir-200N
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: 
           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?

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