No keyboard/mouse after fresh install


I have tried several times to install FreeBSD on my Dell computer but I have a problem. Once the system installation is complete, I install xorg and then KDE. I install following the FreeBSD documentation. Throughout the installation, my keyboard and mouse work fine.

When I reboot after installation, the SDDM login screen appears. From then on, my keyboard and mouse no longer work so I can't connect. If I start the PC in console mode, everything works again.

Do you have any idea what this could be?

Thanks for your help.
Disable SDDM for now, and test X by running startx. Does the keyboard work then? If not run cat /var/log/Xorg.0.log | nc 9999 so we can have a look at your logs.