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FS#4109 - 5GHz Device Loses 5GHz WiFi Connection When Device Views 5GHz Channel Analysis Webpage in Luci #9091

openwrt-bot opened this issue Oct 23, 2021 · 0 comments
flyspray release/21.02


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openwrt-bot commented Oct 23, 2021


  • Device problem occurs on: Linksys WRT1900AC v1

  • Software versions of OpenWrt/LEDE release: OpenWrt 21.02.0 r16279-5cc0535800
    packages: wpad-openssl
    irqbalance (Changed 'enabled' from '0' to '1' in '/etc/config/irqbalance')

  • Things I tried to improve issue:
    Added in Luci > startup > local startup the following commands:

    echo "0" >> /sys/kernel/debug/ieee80211/phy0/mwlwifi/tx_amsdu
    echo "0" >> /sys/kernel/debug/ieee80211/phy1/mwlwifi/tx_amsdu

    Luci > Network > DHCP and DNS: Unchecked Rebind Protection (to allow connections to private work network)

    Luci > Network > Wireless: Edit wlan1 (5GHz network) settings: Interface Configuration > Advanced Settings > Disassociate On Low Acknowledgement: Unchecked.

  • Steps to reproduce:
    When I simply view the radio1 (5GHz) spectrum in Luci (Luci > Status > Channel Analysis) webpage from any of my 5GHz devices (e.g. HP Envy-17ts laptop, Samsung Galaxy Tab-A tablet or Samsung Galaxy J7 phone), its 5GHz wireless connection to the router is dropped after a few seconds (while the webpage is updating), and it often doesn't automatically reconnect. In that case, turning device WiFi OFF then back ON (or for my laptop, switching to airplane mode ON, waiting a bit, then back to OFF) is often required to restore the 5GHz wireless connection. Note: it's the 5GHz connection between the device viewing the 5GHz webpage and the router that is dropped; The 5GHz radio1 on the router stays on (as verified by the logs and viewing 5GHz webpage from a 2.4GHz device, see below).

When I check the radio0 (2.4GHz) spectrum in Luci (Luci > Status > Channel Analysis) webpage from any of my 5GHz wireless devices, its 5GHz connection to the router never drops.

When I check the radio0 (2.4GHz) or radio1 (5GHz) spectrum in Luci (Luci > Status > Channel Analysis) webpages from any of my 2.4GHz devices, its 2.4GHz connection to the router never drops.

I've attached both Kernel and System logs.
Please let me know if you need additional info.
Thank you for your assistance!

@aparcar aparcar added the release/21.02 label Feb 22, 2022
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