I own an HP Pavilion x360 15-dq0206ng laptop, with a Realtek RTL8821CE 802.11ac PCIe adapter. I use the FRITZ! Box 6490 Cable. Furthermore, the AVM Fritz Powerline 1240E / 1000E WLAN Set is integrated in our WLAN network.
Recently, however, my laptop suddenly can't find a 2.4 GHz Wi-Fi connection, although it worked without any problems before. My laptop only connects to 5 GHz Wi-Fi. The FRITZ! Box 6490 Cable can be used in both 2.4 GHz and 5 GHz mode. The AVM Fritz Powerline 1240E / 1000E WLAN Set only supports a 2.4 GHz WLAN connection.
The driver for the Realtek RTL8821CE 802.11ac PCIe adapter has already been uninstalled and reinstalled several times and updated to the latest version, but the connection problem still persists.
How can I fix this problem without rebooting the laptop?
On the router you can set the frequency at which the Wi-Fi signal is transmitted. Either 2.4 or 5 GHz. If only 5 GHz is activated in the router, your laptop can logically only find the 5 GHz Wi-Fi. But what speaks against 5ghz? - The range?
Turn off the 5 GHz network in the router.
Because the Powerline only supports 2.4 GHz Wi-Fi connections (see above). Since my room is too far away from the FritzBox, I need a 2.4 GHz connection to the powerline adapter.
Already happened. Then the laptop can no longer find a Wi-Fi network. However, this problem only occurs with my HP laptop. My smartphone and other devices find both the 2.4 GHz and the 5 GHz connection without any problems.
Then check in the router settings whether 2.4 GHz is activated. This can also be done in the notebook.
Where exactly can this be set on the laptop?
https://www.tutonaut.de/anleitung-5-ghz-wlan-auf-windows-pcs-bevorzugen/
Oh, you mean that. I had already tried that, but without success.
Phew now remote diagnosis is difficult. I would reinstall the driver and test whether the notebook can no longer find any wlan in the 2.4 GHz range.
Uninstalled the driver and restarted the laptop. My laptop can certainly connect to 2.4 GHz networks, but it connects with the statement "Connected - no Internet" or "Connected", with a very bad signal here. Is there a possibility that the WLAN adapter is defective, although the laptop can connect to a 5 GHz WLAN?
Then I can tell you 95% that it's not your notebook but the powerline adapter. Possibly. Is the range of router and adapter too high, i.e. Power cable length. The signal may still go through several circuits, which also causes the signal to suffer. Do you happen to have information about what the power line between router and powerline adaoter looks like?
The problem with you is that the powerline adapter sends out the Wi-Fi signal, but does not receive an internet signal itself or only receives a very weak signal. Powerline doesn't work everywhere
Regarding the power line, unfortunately I have no further information. What I don't understand, however, is why my smartphone can be connected to the powerline network without any problems, but my laptop can't? I also tried to connect my laptop to my smartphone via hotspot (also 2.4 GHz) but that doesn't work either. So I believe that the problem really has to do with the 2.4 GHz. I don't know why though. I haven't changed anything.
I also asked earlier whether the notebook can be connected to another 2.4 GHz network or whether it can be found. You can only try to exclude. If the powerline adapter works with other devices, the problem will also be with the notebook. Possibly. A hardware defect
