From Fedora Project Wiki
General bug reports
If you are experiencing a problem with Xorg, the following would be useful to attach to your bug report (individually, uncompressed):
/etc/X11/xorg.conf
(or, if this file does not exist, specify in the bug report that it does not)- X server log file(s)
/var/log/Xorg.*.log
/var/log/Xorg.0.log
from a trial run where you move/etc/X11/xorg.conf
aside and let Xorg autodetect your hardware (if you have such a file).
Stack traces
See the documentation on the upstream wiki.