# 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@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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