[FS#3682] DFS Scan does not work with R7800 and Snapshot

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - NilsRo (NilsRo) 

Attached to Project - OpenWrt/LEDE Project
Summary - DFS Scan does not work with R7800 and Snapshot
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details -  - Netgear R7800
 - OpenWrt SNAPSHOT r16174-9530b9bb78 / LuCI Master git-21.060.51374-cd06e70
 - Simply try to activate 160Mhz mode for WLAN0
   
Error is marked below. Start of DFS scan failed. Worked fine in stable 19.07.7
 

Sat Mar 13 13:56:02 2021 daemon.notice netifd: Network device 'tap_vpn' link is up
Sat Mar 13 13:56:02 2021 daemon.notice netifd: Interface 'VPN' has link connectivity
Sat Mar 13 13:56:02 2021 daemon.debug dnsmasq[3234]: stopped listening on ifb4eth0.2(#17): fe80::446d:ecff:fe53:d19d port 53
Sat Mar 13 13:56:02 2021 daemon.debug dnsmasq[3234]: listening on tap_vpn(#21): 192.168.177.6 port 53
Sat Mar 13 13:56:02 2021 kern.info kernel: [   46.882314] br-lan: port 4(wlan1) entered blocking state
Sat Mar 13 13:56:02 2021 kern.info kernel: [   46.882341] br-lan: port 4(wlan1) entered disabled state
Sat Mar 13 13:56:02 2021 kern.info kernel: [   46.887211] device wlan1 entered promiscuous mode
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan1: interface state UNINITIALIZED->COUNTRY_UPDATE
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: ACS: Automatic channel selection started, this may take a bit
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan1: interface state COUNTRY_UPDATE->ACS
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan1: ACS-STARTED
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DFS
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5180 chan=36 sec_chan=1, width=2, seg0=50, seg1=0, cac_time=60s
**Sat Mar 13 13:56:02 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Sat Mar 13 13:56:02 2021 daemon.err hostapd: Interface initialization failed
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan0: interface state DFS->DISABLED
Sat Mar 13 13:56:02 2021 daemon.notice hostapd: wlan0: AP-DISABLED**
Sat Mar 13 13:56:02 2021 user.notice SQM: Starting SQM script: piece_of_cake.qos on eth0.2, in: 52000 Kbps, out: 34000 Kbps
Sat Mar 13 13:56:03 2021 daemon.debug dnsmasq[3234]: listening on ifb4eth0.2(#24): fe80::60be:29ff:fe04:e719%ifb4eth0.2 port 53
Sat Mar 13 13:56:04 2021 daemon.debug dnsmasq[3234]: listening on tap_vpn(#21): fe80::5c10:4cff:fe75:60f9%tap_vpn port 53

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3682

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