I have the exact same issue with some tplink and dlink routers and soon
to test on a TL-WR841N/ND v8.
Regarding the dlink i found differences and gaining 1dBm when changing
the country code to US.
Also some time ago as i played with txpower; at moments it would
actually go to 20dBm but after restart it would go back to 15dBm.
This still remains with AA r35153 for those routers like the dir 601a.
Currently i have AA r38401 with the same configuration as the other dir
601a in another dir 601a and i get 17 dBm but when changing to US
country code it goes back to 15 dBm.
(I also played with channel selection)
Another curious fact is on the dir 601a depends on the channel used.
Frequencies:
* 2412 MHz [1] (15.0 dBm)
* 2417 MHz [2] (16.0 dBm)
* 2422 MHz [3] (16.0 dBm)
* 2427 MHz [4] (16.0 dBm)
* 2432 MHz [5] (16.0 dBm)
* 2437 MHz [6] (16.0 dBm)
* 2442 MHz [7] (16.0 dBm)
* 2447 MHz [8] (16.0 dBm)
* 2452 MHz [9] (16.0 dBm)
* 2457 MHz [10] (16.0 dBm)
* 2462 MHz [11] (15.0 dBm)
* 2467 MHz [12] (17.0 dBm)
* 2472 MHz [13] (17.0 dBm)
* 2484 MHz [14] (disabled)
with the dir 615c1 i get similar information where some channels give
20dBm and others in the middle less while the first ones also go up to 20dBm
This happens with AA r38401 while with AA r35153 all frequencies go up
to 20dBm.
when compiling the image:
[*] Force Atheros drivers to respect the user's regdomain settings
Seems to have some relevance in regards to this issue.
I think i might have opened a ticket about this sometime ago.
On 10/17/2013 08:31 AM, Bastian Bittorf wrote:
> 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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> openwrt-devel@lists.openwrt.org
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>
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