Wifi hotspot does not work when band A is selected

[Tom Cook]

I'm using a built-in RTL8822BE WiFi adapter on a Ryzen 7 system. When I create a hotspot by opening the GNOME settings app, opening the WiFi settings page and selecting "Turn on hotspot..." from the drop-down menu, everything works fine. If I then open nm-connection-editor and edit the connection to select band A (5GHz), the hotspot fails to start. If I then open the connection editor again and switch back to automatic band selection, the hotspot works again.

When it fails, this appears in syslog:

May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8638] device (wlo1): Activation: starting connection 'Hotspot' (514f603b-25e2-4c1e-9220-7b77ed966ff5)
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8643] device (wlo1): supplicant interface state: completed -> disconnected
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8653] device (wlo1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8676] device (wlo1): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8783] device (wlo1): Activation: (wifi) access point 'Hotspot' has security, but secrets are required.
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8783] device (wlo1): state change: config -> need-auth (reason 'none', sys-iface-state: 'managed')
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8800] device (wlo1): state change: need-auth -> prepare (reason 'none', sys-iface-state: 'managed')
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8810] device (wlo1): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
May 25 10:21:30 frog NetworkManager[815]: <info> [1653470490.8883] device (wlo1): Activation: (wifi) connection 'Hotspot' has security, and secrets exist. No new secrets needed.
May 25 10:21:30 frog wpa_supplicant[866]: wlo1: Failed to start AP functionality
May 25 10:21:56 frog NetworkManager[815]: <warn> [1653470516.1521] device (wlo1): Activation: (wifi) Hotspot network creation took too long, failing activation
May 25 10:21:56 frog NetworkManager[815]: <info> [1653470516.1522] device (wlo1): state change: config -> failed (reason 'supplicant-timeout', sys-iface-state: 'managed')
May 25 10:21:56 frog NetworkManager[815]: <warn> [1653470516.1526] device (wlo1): Activation: failed for connection 'Hotspot'
May 25 10:21:56 frog wpa_supplicant[866]: wlo1: CTRL-EVENT-DSCP-POLICY clear_all
May 25 10:21:56 frog NetworkManager[815]: <info> [1653470516.1530] device (wlo1): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
May 25 10:21:56 frog wpa_supplicant[866]: wlo1: Reject scan trigger since one is already pending
May 25 10:21:59 frog wpa_supplicant[866]: wlo1: CTRL-EVENT-REGDOM-CHANGE init=BEACON_HINT type=UNKNOWN

I'm guessing that NetworkManager is getting the way it drives wpa_supplicant wrong when the 5GHz band is selected, but it's only a guess.

Ubuntu version is:

tkcook@frog:~$ lsb_release -rd
Description: Ubuntu 22.04 LTS
Release: 22.04

NetworkManager version is:

tkcook@frog:~$ apt-cache policy network-manager-gnome
network-manager-gnome:
  Installed: 1.24.0-1ubuntu3
  Candidate: 1.24.0-1ubuntu3
  Version table:
 *** 1.24.0-1ubuntu3 500
        500 http://gb.archive.ubuntu.com/ubuntu jammy/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: network-manager-gnome 1.24.0-1ubuntu3
Uname: Linux 5.18.0 x86_64
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed May 25 10:29:37 2022
InstallationDate: Installed on 2021-08-27 (270 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
SourcePackage: network-manager-applet
UpgradeStatus: Upgraded to jammy on 2022-05-05 (19 days ago)
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.36.4 connected started full enabled enabled enabled enabled disabled