Errors when reconnecting WiFi

[CommanderRedYT]

System: AMD Laptop (Ubuntu 20.04 LTS), could also be on other Systems

Bluetooth works perfectly fine, but WiFi has some problems for me...

I can perfectly scan for WiFis and connect to it. But if I already was connected to a network (so switching from one network to another), the "Please enter the password again" (so false password)-Dialog shows up. But if I reboot my machine, I can connect to the WiFi.

Summary: I can only connect to a wifi after (re)booting, but cannot switch wifis

[micwoj92]

I'm only having such issues on eduroam networks. Home networks, smartphone hotspot work without issue. Maybe connection manager issue? I am using connman 1.39.

[CommanderRedYT]

I tried it with nmcli and the cinnamon network manager... Also, sometimes it asks for a password even if it is successfully connected..

[geekdiop]

Hello, can you run this command please : " journalctl -au NetworkManager --follow ", and show us the logs ?

[kelebek333]

You can try to run following commands for disabling network manager's power management.

echo -e '[connection]\nwifi.powersave = 2' | sudo tee /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

sudo systemctl restart NetworkManager

[CommanderRedYT]

Finally fixed it. Apparently the kernel modules from older kernels where installed but never deleted, so about 8 of them (ubuntu 20.04 & 21.04, also different "subversions") were loaded at the same time causing issues. Fix was to delete all of the kernel modules (rtl8821ce) and reinstall the dkms package.