I think the Fedora release notes mention that if you run the tool
system-config-display, it will automatically generate an xorg.conf for
you.
From the Common F11 Bugs, under "Miscellaneous problems with
Intel
graphics adapters ":
https://fedoraproject.org/wiki/Common_F11_bugs#intel-misc-gfx
"/etc/X11/xorg.conf. If that file does not exist, you can run
system-config-display as root to create it."