we are facing a strange issue on 2 routers with identical
hardware: TP-LINK TL-WR841N/ND v8 - i cannot set txpower >18 dBm
according to 'iwconfig'/'iwinfo' on ONE router. the
other (different location, same openwrt-revision r38432) can do that:
root@BerkaerBahnhof-Knoten59:~ uci set wireless.radio0.txpower=15; wifi; sleep
30; iwinfo
command failed: Device or resource busy (-16)
Configuration file: /var/run/hostapd-phy0.conf
Using interface wlan0 with hwaddr 64:70:02:59:41:3e and ssid
"BerkaerBahnhofWeimarnetz"
wlan0 ESSID: "BerkaerBahnhofWeimarnetz"
Access Point: 64:70:02:59:41:3E
Mode: Master Channel: 5 (2.432 GHz)
Tx-Power: 15 dBm Link Quality: 36/70
Signal: -74 dBm Noise: -95 dBm
Bit Rate: 14.4 MBit/s
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
wlan0-1 ESSID: "weimarnetz"
Access Point: 02:CA:FF:EE:BA:BE
Mode: Ad-Hoc Channel: 5 (2.432 GHz)
Tx-Power: 15 dBm Link Quality: unknown/70
Signal: unknown Noise: -95 dBm
Bit Rate: unknown
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
root@BerkaerBahnhof-Knoten59:~ uci set wireless.radio0.txpower=20; wifi; sleep
30; iwinfo
command failed: Device or resource busy (-16)
Configuration file: /var/run/hostapd-phy0.conf
Using interface wlan0 with hwaddr 64:70:02:59:41:3e and ssid
"BerkaerBahnhofWeimarnetz"
wlan0 ESSID: "BerkaerBahnhofWeimarnetz"
Access Point: 64:70:02:59:41:3E
Mode: Master Channel: 5 (2.432 GHz)
Tx-Power: 20 dBm Link Quality: 29/70
Signal: -81 dBm Noise: -95 dBm
Bit Rate: 13.0 MBit/s
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
wlan0-1 ESSID: "weimarnetz"
Access Point: 02:CA:FF:EE:BA:BE
Mode: Ad-Hoc Channel: 5 (2.432 GHz)
Tx-Power: 20 dBm Link Quality: unknown/70
Signal: unknown Noise: -95 dBm
Bit Rate: unknown
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
root@BerkaerBahnhof-Knoten59:~ uci show wireless
wireless.radio0=wifi-device
wireless.radio0.type=mac80211
wireless.radio0.country=BO
wireless.radio0.channel=5
wireless.radio0.frag=off
wireless.radio0.beacon_int=1000
wireless.radio0.path=platform/ar934x_wmac
wireless.radio0.hwmode=11ng
wireless.radio0.htmode=HT20
wireless.radio0.ht_capab=LDPC SHORT-GI-20 SHORT-GI-40 TX-STBC RX-STBC1
DSSS_CCK-40
wireless.radio0.txpower=20
wireless.@wifi-iface[0]=wifi-iface
wireless.@wifi-iface[0].device=radio0
wireless.@wifi-iface[0].network=wlanadhoc
wireless.@wifi-iface[0].mode=adhoc
wireless.@wifi-iface[0].bssid=02:ca:ff:ee:ba:be
wireless.@wifi-iface[0].ssid=weimarnetz
wireless.@wifi-iface[0].mcast_rate=1000
wireless.@wifi-iface[1]=wifi-iface
wireless.@wifi-iface[1].device=radio0
wireless.@wifi-iface[1].network=wlan
wireless.@wifi-iface[1].mode=ap
wireless.@wifi-iface[1].ssid=BerkaerBahnhofWeimarnetz
wireless.@wifi-iface[1].encryption=none
wireless.@auto_optimize[0]=auto_optimize
wireless.@auto_optimize[0].neigh=off
###################### the other one ################
root@die-koenigin:~ uci set wireless.radio0.txpower=15; wifi; sleep 30; iwinfo
command failed: Device or resource busy (-16)
Configuration file: /var/run/hostapd-phy0.conf
Using interface wlan0 with hwaddr 64:66:b3:ab:4c:e0 and ssid "Weimarnetz -
Breitscheid 4"
wlan0 ESSID: "Weimarnetz - Breitscheid 4"
Access Point: 64:66:B3:AB:4C:E0
Mode: Master Channel: 5 (2.432 GHz)
Tx-Power: 15 dBm Link Quality: unknown/70
Signal: unknown Noise: -95 dBm
Bit Rate: unknown
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
wlan0-1 ESSID: "weimarnetz"
Access Point: 02:CA:FF:EE:BA:BE
Mode: Ad-Hoc Channel: 5 (2.432 GHz)
Tx-Power: 15 dBm Link Quality: 23/70
Signal: -87 dBm Noise: -95 dBm
Bit Rate: 1.0 MBit/s
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
root@die-koenigin:~ uci set wireless.radio0.txpower=20; wifi; sleep 30; iwinfo
command failed: Device or resource busy (-16)
Configuration file: /var/run/hostapd-phy0.conf
Using interface wlan0 with hwaddr 64:66:b3:ab:4c:e0 and ssid "Weimarnetz -
Breitscheid 4"
wlan0 ESSID: "Weimarnetz - Breitscheid 4"
Access Point: 64:66:B3:AB:4C:E0
Mode: Master Channel: 5 (2.432 GHz)
Tx-Power: 18 dBm Link Quality: unknown/70
Signal: unknown Noise: -95 dBm
Bit Rate: unknown
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
wlan0-1 ESSID: "weimarnetz"
Access Point: 02:CA:FF:EE:BA:BE
Mode: Ad-Hoc Channel: 5 (2.432 GHz)
Tx-Power: 18 dBm Link Quality: 26/70
Signal: -84 dBm Noise: -95 dBm
Bit Rate: 1.0 MBit/s
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0
root@die-koenigin:~ uci show wireless
wireless.radio0=wifi-device
wireless.radio0.type=mac80211
wireless.radio0.country=BO
wireless.radio0.channel=5
wireless.radio0.frag=off
wireless.radio0.beacon_int=1000
wireless.radio0.path=platform/ar934x_wmac
wireless.radio0.hwmode=11ng
wireless.radio0.htmode=HT20
wireless.radio0.ht_capab=LDPC SHORT-GI-20 SHORT-GI-40 TX-STBC RX-STBC1
DSSS_CCK-40
wireless.radio0.txpower=20
wireless.@wifi-iface[0]=wifi-iface
wireless.@wifi-iface[0].device=radio0
wireless.@wifi-iface[0].network=wlanadhoc
wireless.@wifi-iface[0].mode=adhoc
wireless.@wifi-iface[0].bssid=02:ca:ff:ee:ba:be
wireless.@wifi-iface[0].ssid=weimarnetz
wireless.@wifi-iface[0].mcast_rate=1000
wireless.@wifi-iface[0].encryption=none
wireless.@wifi-iface[1]=wifi-iface
wireless.@wifi-iface[1].device=radio0
wireless.@wifi-iface[1].network=wlan
wireless.@wifi-iface[1].mode=ap
wireless.@wifi-iface[1].ssid=Weimarnetz - Breitscheid 4
wireless.@auto_optimize[0]=auto_optimize
wireless.@auto_optimize[0].neigh=off
what can we do?
bye, bastian
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