I am using Realtek RTL8723BE wireless adapter on my Ubuntu 18.04.1. I was using it since Ubuntu 16.04, there was the problem of weak signal and unable to detect any AP, so I found these command lines to fix the problem.

sudo modprobe -r rtl8723be
sudo modprobe rtl8723be ant_sel=1
iwlist scan | egrep -i 'ssid|level'
echo "options rtl8723be fwlps=0 ips=0 ant_sel=1" | sudo tee /etc/modprobe.d/rtl8723be.conf

Of course, the ant_sel=1 can be change to 2 for another antenna.

It works well for 2 years, until the recent Linux Kernal 4.15.0-33, in this version of kernal, the signal becames weak again, and the command lines do not work anymore. I will have to boots the 4.15.0-32 version everytime I start my laptop.

Anyone facing the same issue? Anyone have the soluntion to this?

Thank you.

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