Think the regulatory domain is not being set anywhere as
/etc/default/crda has REGDOMAIN= and sudo cat /run/netplan/wpa-
wlan0.conf has
ctrl_interface=/run/wpa_supplicant
network={
ssid="SHEW-DB9990"
key_mgmt=WPA-PSK
psk="nope"
}
Might explain 'ieee80211 phy0: brcmf_escan_timeout: timer expired'
above.
https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git/tree/README#n8
For manual changing of regulatory domains use iw (iw reg set) or wpa_supplicant.
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https://bugs.launchpad.net/bugs/1862760
Title:
Unreliable 802.11ac connection on our raspi images
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