#16744: ath9k/mac80211: ignored txpower offset on Ubiquiti devices
-------------------------------------+-------------------------------------
Reporter: linus.luessing@… | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone: Attitude Adjustment
Component: packages | 12.09
Keywords: ath9k mac80211 ubiquiti | Version: Trunk
nanostation txpower offset |
-------------------------------------+-------------------------------------
It seems that the 12 dBi antenna of the Ubiquiti NanoStation M2 is
properly set in the firmware, at least a 12dB txpower offset is noted in
iwinfo. However, the txpower is not reduced accordingly:
{{{
$ iwinfo
wlan0 ESSID: "luebeck.freifunk.net"
Access Point: 24:A4:3C:AC:F4:AC
Mode: Master Channel: 1 (2.412 GHz)
Tx-Power: 30 dBm Link Quality: 40/70
Signal: -70 dBm Noise: -89 dBm
Bit Rate: 43.6 MBit/s
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:002A 0777:E012 [Ubiquiti NanoStation M2]
TX power offset: 12 dB
Frequency offset: none
Supports VAPs: yes
wlan0-1 ESSID: "02:d1:11:37:fc:38"
Access Point: 02:D1:11:37:FC:38
Mode: Ad-Hoc Channel: 1 (2.412 GHz)
Tx-Power: 30 dBm Link Quality: 69/70
Signal: -41 dBm Noise: -89 dBm
Bit Rate: 102.3 MBit/s
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:002A 0777:E012 [Ubiquiti NanoStation M2]
TX power offset: 12 dB
Frequency offset: none
Supports VAPs: yes
}}}
The reg domain is set correctly, too:
{{{
$ iw reg get
country DE:
(2400 - 2483 @ 40), (N/A, 20)
(5150 - 5250 @ 80), (N/A, 20), NO-OUTDOOR
(5250 - 5350 @ 80), (N/A, 20), NO-OUTDOOR, DFS
(5470 - 5725 @ 80), (N/A, 27), DFS
(57240 - 65880 @ 2160), (N/A, 40), NO-OUTDOOR
}}}
{{{
$ iwinfo wlan0-1 txpowerlist
12 dBm ( 15 mW)
13 dBm ( 19 mW)
14 dBm ( 25 mW)
15 dBm ( 31 mW)
16 dBm ( 39 mW)
17 dBm ( 50 mW)
18 dBm ( 63 mW)
19 dBm ( 79 mW)
20 dBm ( 100 mW)
21 dBm ( 125 mW)
22 dBm ( 158 mW)
23 dBm ( 199 mW)
24 dBm ( 251 mW)
25 dBm ( 316 mW)
26 dBm ( 398 mW)
27 dBm ( 501 mW)
28 dBm ( 630 mW)
29 dBm ( 794 mW)
* 30 dBm (1000 mW)
}}}
For Ubiquiti NanoStation M2 loco and Ubiquiti Unifi-AP things seem to be a
bit more tricky, the txpower offset seems to be unavailable here:
Ubiquiti NanoStation M2 loco:
{{{
$ iwinfo
wlan0 ESSID: "luebeck.freifunk.net"
Access Point: 24:A4:3C:74:49:3A
Mode: Master Channel: 1 (2.412 GHz)
Tx-Power: 20 dBm Link Quality: 32/70
Signal: -78 dBm Noise: -95 dBm
Bit Rate: 34.2 MBit/s
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:002E 0777:E0A2 [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes
wlan0-1 ESSID: "02:d1:11:37:fc:38"
Access Point: 02:D1:11:37:FC:38
Mode: Ad-Hoc Channel: 1 (2.412 GHz)
Tx-Power: 20 dBm Link Quality: 51/70
Signal: -59 dBm Noise: -95 dBm
Bit Rate: 43.8 MBit/s
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:002E 0777:E0A2 [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes
}}}
Ubiquiti Unifi-AP:
{{{
$ iwinfo
wlan0 ESSID: "luebeck.freifunk.net"
Access Point: 24:A4:3C:7D:D0:1B
Mode: Master Channel: 1 (2.412 GHz)
Tx-Power: 20 dBm Link Quality: 23/70
Signal: -87 dBm Noise: -94 dBm
Bit Rate: 9.0 MBit/s
Encryption: none
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:002E 0777:E512 [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes
wlan0-1 ESSID: "02:d1:11:37:fc:38"
Access Point: 02:D1:11:37:FC:38
Mode: Ad-Hoc Channel: 1 (2.412 GHz)
Tx-Power: 20 dBm Link Quality: 56/70
Signal: -54 dBm Noise: -94 dBm
Bit Rate: 31.1 MBit/s
Encryption: unknown
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 168C:002E 0777:E512 [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes
}}}
The version of mac80211 used is [http://nbd.name/gitweb.cgi?p=aa-
mac80211.git;a=commitdiff;h=8d86801ae606544faee1e0e25ef59a3f8f059871
this]. Which should match trunk, r39758.
--
Ticket URL: <https://dev.openwrt.org/ticket/16744>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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