I solved the problem by copying the file /usr/share/doc/xserver-xorg- video-intel/xorg.conf to the directory /etc/X11/
Some Xorg logs: LightDM Log: https://paste.debian.net/1079159/ Xorg log before: https://paste.debian.net/1079164/ Xorg Log after: https://paste.debian.net/1079167/
