If you find a reproducible bug in software in the xc directory, or find bugs in the xc documentation, please send a bug report to the X Consortium using the form in the file xc/bug-report and this destination address:
xbugs@x.org
Please try to provide all of the information requested on the form if it is applicable; the little extra time you spend on the report will make it much easier for us to reproduce, find, and fix the bug. Receipt of bug reports is generally acknowledged, but sometimes it can be delayed by a few weeks.
Bugs in contrib software should not be reported to the X Consortium. Consult the documentation for the individual software to see where (if anywhere) to report the bug.