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This is on a system upgraded from Buster to Bullseye. Ethernet works fine, but WiFi cannot scan for available networks with "No carrier" error message:

pi@raspberrypi:~ $ connmanctl enable wifi
Error wifi: Already enabled
pi@raspberrypi:~ $ connmanctl scan wifi
Error /net/connman/technology/wifi: No carrier

I can see that wlan0 is there, not blocked by rfkill and wpa_supplicant is running.

pi@raspberrypi:~ $ iwconfig
lo        no wireless extensions.
eth0      no wireless extensions.
wlan0     IEEE 802.11  ESSID:off/any
          Mode:Managed  Access Point: Not-Associated   Tx-Power=31 dBm
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
pi@raspberrypi:~ $ rfkill list
0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: hci0: Bluetooth
        Soft blocked: yes
        Hard blocked: no
pi@raspberrypi:~ $ systemctl status 579
● dhcpcd.service - dhcpcd on all interfaces
     Loaded: loaded (/lib/systemd/system/dhcpcd.service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2021-11-19 16:40:15 CET; 24h ago
    Process: 429 ExecStart=/usr/lib/dhcpcd5/dhcpcd -q -b (code=exited, status=0/SUCCESS)
   Main PID: 489 (dhcpcd)
      Tasks: 2 (limit: 4915)
        CPU: 34.626s
     CGroup: /system.slice/dhcpcd.service
             ├─489 /sbin/dhcpcd -q -b
             └─579 wpa_supplicant -B -c/etc/wpa_supplicant/wpa_supplicant.conf -iwlan0 -Dnl80211,wext

Is there anything else I should check? Or is connmanctl not supposed to work on Bullseye?

@Milliways, connman appears to be installed as a dependency of lxde, which is what I have for desktop on the Pi:

pi@raspberrypi:~ $ apt-cache --installed rdepends connman-gtk
connman-gtk
Reverse Depends:
 |lxde
Dmitry Grigoryev
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1 Answers1

3

I would just delete connman - from similar posts the dhcpcd plugin (I would have to search to find its name) appears to be installed.

Its normal operation depends on the dhcpcd service (which appears to be running) but dhcpcd disables itself and its wpa supplicant plug-in if another DHCP client is active.

I will investigate later if this doesn't resolve your issue.

I would use CLI to see what IP have been allocated.

See https://www.raspberrypi.com/news/another-raspbian-desktop-user-interface-update/

I think you want the dhcpcd-ui package

apt search dhcpcd-ui
lxplug-network/stable,now 0.29 armhf [installed,automatic]
  Network plugin for lxpanel
Milliways
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