DFS-RADAR-DETECTED then it sets wifi to an invalid channel

Banana Pi Router design BPI-R4(MT7988)
1

Hi, I’m experiencing this on both OpenWRT-SNAPSHOT (r28459 and prior versions) and OpenWRT-24.10.0-RC4

Whenever the 5ghz channel has a DFS Radar detection event, it sets itself to an invalid (6ghz) channel.


Fri Jan  3 12:29:18 2025 daemon.notice hostapd: phy0.1-ap0: DFS-RADAR-DETECTED freq=5500 ht_enabled=0 chan_offset=0 chan_width=5 cf1=5570 cf2=0
Fri Jan  3 12:29:18 2025 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Jan  3 12:29:18 2025 daemon.notice hostapd: phy0.1-ap0: AP-DISABLED

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edit; issue seems to be similar to this one R7800 - 5Ghz breaks after DFS radar detection · Issue #9864 · openwrt/openwrt

2

Maybe you shouldn’t use fixed channel in DFS range.

3

you should report this as a bug with openwrt

4

He just has nowhere to go with fixed channel.

5

Quick update here, I’m using channel 64 and 60 (fixed channels) and I periodically find that my 5ghz wifi re-assigns itself into the 6ghz range again (thus being invalid for use). OpenWRT Snapshot r28608

I have not seen this behavior when assigning channel 36. I’ll look at filing a bug report with OpenWRT.