Ok, I was able to find the problem. I ran htop and noticed that both nm-applet and NetworkManager had a quite high CPU load. I then inspected /var/log/syslog and I could see this running endlessly:
Jun 11 15:39:10 serenity miredo[2182]: miredo[2182]: Starting... Jun 11 15:39:10 serenity miredo[2182]: Starting... Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.4820] manager: (teredo): new Tun device (/org/freedesktop/NetworkManager/Devices/265661) Jun 11 15:39:10 serenity miredo[1150861]: miredo[1150861]: New Teredo address/MTU Jun 11 15:39:10 serenity miredo[1150861]: miredo[1150861]: Teredo pseudo-tunnel started Jun 11 15:39:10 serenity miredo[1150861]: miredo[1150861]: (address: 2001:0:c38c:c38c:cb2:712b:39cf:3fc7, MTU: 1280) Jun 11 15:39:10 serenity miredo[1150861]: New Teredo address/MTU Jun 11 15:39:10 serenity miredo[1150861]: Teredo pseudo-tunnel started Jun 11 15:39:10 serenity miredo[1150861]: (address: 2001:0:c38c:c38c:cb2:712b:39cf:3fc7, MTU: 1280) Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6394] device (teredo): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6463] device (teredo): state change: unavailable -> disconnected (reason 'connection-assumed', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6484] device (teredo): Activation: starting connection 'teredo' (d0ec8979-3764-4c90-a2e1-2377f7607fc3) Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6488] device (teredo): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6498] device (teredo): state change: prepare -> config (reason 'none', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6505] device (teredo): state change: config -> ip-config (reason 'none', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6533] device (teredo): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6581] device (teredo): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6587] device (teredo): state change: secondaries -> activated (reason 'none', sys-iface-state: 'external') Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.6608] device (teredo): Activation: successful, device activated. Jun 11 15:39:10 serenity systemd[1]: Reloading Teredo IPv6 tunneling... Jun 11 15:39:10 serenity miredo[2182]: miredo[2182]: Reloading configuration on signal 1 (Hangup) Jun 11 15:39:10 serenity miredo[2182]: Reloading configuration on signal 1 (Hangup) Jun 11 15:39:10 serenity systemd[1]: Reloaded Teredo IPv6 tunneling. Jun 11 15:39:10 serenity NetworkManager[816]: <info> [1654976350.7380] device (teredo): state change: activated -> unmanaged (reason 'connection-assumed', sys-iface-state: 'external') Jun 11 15:39:10 serenity miredo[2182]: miredo[2182]: Child 1150861 exited (code: 0) Jun 11 15:39:10 serenity miredo[2182]: Child 1150861 exited (code: 0) Jun 11 15:39:10 serenity miredo[2182]: miredo[2182]: Starting... Jun 11 15:39:10 serenity miredo[2182]: Starting... And so on, endlessly. I uninstalled miredo (not using an IPv6 tunnel at the momend) and the problem got solved. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager-applet in Ubuntu. https://bugs.launchpad.net/bugs/1978363 Title: The menu blinks constantly Status in network-manager-applet package in Ubuntu: New Bug description: I've found this problem on Xubuntu 22.04, fresh update. When I click on the network icon in the taskbar, I expect to get the menu of available wifi networks, etc. This happens, but the menu blinks so much that it's impossible to use it. I'm attaching a small screencast to show the problem. When XFCE starts, I get a few seconds of "peace" before this starts. This might be related to https://bugs.launchpad.net/ubuntu/+source/network-manager- applet/+bug/1735367 I'd be happy to provide more information (logs, etc), but right now I don't know where to look. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1978363/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
