WiFi Tx power question

jd1008 jd1008 at gmail.com
Fri Sep 19 00:23:42 UTC 2014


# lspci | grep -i wifi
0c:00.0 Network controller: Intel Corporation WiFi Link 5100
dmesg | grep -i iwlwifi
[   10.019366] iwlwifi 0000:0c:00.0: Detected Intel(R) WiFi Link 5100 
AGN, REV=0x54

dmesg also  shows
[  266.827254] wlan0: Limiting TX power to 36 (36 - 0) dBm as advertised 
by 00:0d:67:6a:5a:19

iwconfig wlan0
$ iwconfig wlan0
wlan0     IEEE 802.11abgn  ESSID:"attwifi"
           Mode:Managed  Frequency:2.462 GHz  Access Point: 
00:0D:67:6A:5A:19
           Bit Rate=72.2 Mb/s   Tx-Power=15 dBm
           Retry short limit:7   RTS thr:off   Fragment thr:off
           Power Management:off
           Link Quality=35/70  Signal level=-50 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:20   Missed beacon:0

So, reason I am asking is that I would like to increase Tx power to 30dBm
due to poor connectivity with the hotspot router.

I tried
# iwconfig wlan0 txpower 30dBm
{7917-jd at localhost}# echo $?
0
# iwconfig wlan0
wlan0     IEEE 802.11abgn  ESSID:"attwifi"
           Mode:Managed  Frequency:2.462 GHz  Access Point: 
00:0D:67:6A:5A:19
           Bit Rate=72.2 Mb/s   Tx-Power=15 dBm
           Retry short limit:7   RTS thr:off   Fragment thr:off
           Encryption key:off
           Power Management:off
           Link Quality=35/70  Signal level=-50 dBm
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:20   Missed beacon:0

So, iwconfig is not setting Tx power. Not sure if this is a limitation
of the wifi card or a bug in the wifi driver or if a bug in iwconfig.





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