FS#1133 - Can't set channels 12 and 13 on Raspberry Pi 3 in AP config

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Quiet
Tech stack
linux, raspberry-pi
Domain
embedded-iot, networking, operating-systems

Research direction

Start at the brcmfmac brcmf_cfg80211_start_ap entry point and reproduce the failure using the UCI wireless configuration and iw list output described here. Compare AP startup on channels 11, 12, and 13 on the Raspberry Pi 3; done means channels 12 and 13 start without the Set Channel failed error.

Written by the indexing model from the issue text.

Description

flyspray

valdi74:

It is not possible to set up channel 12/13 on Raspberry Pi 3 in Wifi AP configuration. I get error "brcmfmac: brcmf_cfg80211_start_ap: Set Channel failed: chspec=4109, -20".
Tested on 17.01.1 and latest snapshot (r5217-098afa1).
PS Raspbian works properly on 13 channel as AP.

Logs:
root@LEDE:~# uci show wireless
wireless.radio0=wifi-device
wireless.radio0.type='mac80211'
wireless.radio0.hwmode='11g'
wireless.radio0.path='platform/soc/3f300000.mmc/mmc_host/mmc1/mmc1:0001/mmc1:0001:1'
wireless.radio0.htmode='HT20'
wireless.radio0.disabled='0'
wireless.radio0.country='PL'
wireless.radio0.channel='11'
wireless.default_radio0=wifi-iface
wireless.default_radio0.device='radio0'
wireless.default_radio0.network='lan'
wireless.default_radio0.mode='ap'
wireless.default_radio0.ssid='Dantooine'
wireless.default_radio0.encryption='psk2'
wireless.default_radio0.key='secret'

root@LEDE:~# wifi
[ 828.291269] device wlan0 left promiscuous mode
[ 828.301579] br-lan: port 2(wlan0) entered disabled state
[ 830.594037] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 830.608333] br-lan: port 2(wlan0) entered blocking state
[ 830.619697] br-lan: port 2(wlan0) entered disabled state
[ 830.631336] device wlan0 entered promiscuous mode
[ 830.911507] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 830.924197] br-lan: port 2(wlan0) entered blocking state
[ 830.935606] br-lan: port 2(wlan0) entered forwarding state

root@LEDE:# uci set wireless.radio0.channel=13
root@LEDE:# uci commit wireless
root@LEDE:~# wifi
[ 913.551274] device wlan0 left promiscuous mode
[ 913.561751] br-lan: port 2(wlan0) entered disabled state
[ 915.854693] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 915.869110] br-lan: port 2(wlan0) entered blocking state
[ 915.880481] br-lan: port 2(wlan0) entered disabled state
[ 915.892046] device wlan0 entered promiscuous mode
[ 916.080443] brcmfmac: brcmf_cfg80211_start_ap: Set Channel failed: chspec=4109, -20
[ 916.131249] device wlan0 left promiscuous mode
[ 916.142014] br-lan: port 2(wlan0) entered disabled state
[ 927.997654] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 928.012458] br-lan: port 2(wlan0) entered blocking state
[ 928.024440] br-lan: port 2(wlan0) entered disabled state
[ 928.036703] device wlan0 entered promiscuous mode
[ 928.222287] brcmfmac: brcmf_cfg80211_start_ap: Set Channel failed: chspec=4109, -20
[ 928.301237] device wlan0 left promiscuous mode
[ 928.312608] br-lan: port 2(wlan0) entered disabled state

root@LEDE:# uci set wireless.radio0.channel=11
root@LEDE:# uci commit wireless
root@LEDE:~# wifi
[ 990.032785] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 990.048153] br-lan: port 2(wlan0) entered blocking state
[ 990.060246] br-lan: port 2(wlan0) entered disabled state
[ 990.072619] device wlan0 entered promiscuous mode
[ 990.351670] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 990.365070] br-lan: port 2(wlan0) entered blocking state
[ 990.377132] br-lan: port 2(wlan0) entered forwarding state
[ 1000.491313] device wlan0 left promiscuous mode
[ 1000.502769] br-lan: port 2(wlan0) entered disabled state
[ 1002.676007] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 1002.691453] br-lan: port 2(wlan0) entered blocking state
[ 1002.703651] br-lan: port 2(wlan0) entered disabled state
[ 1002.716135] device wlan0 entered promiscuous mode
[ 1003.093512] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 1003.107183] br-lan: port 2(wlan0) entered blocking state
[ 1003.119522] br-lan: port 2(wlan0) entered forwarding state

root@LEDE:~# iw list
Wiphy phy0
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 16
max # match sets: 16
max # scan plans: 1
max scan plan interval: 508
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports T-DLS.
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 1:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-7
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (20.0 dBm)
* 2472 MHz [13] (20.0 dBm)****
* 2484 MHz [14] (disabled)
valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,
total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,
total <= 4, #channels <= 1

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