currently, qxcbconnection.cpp contains:
qWarning("QXcbConnection: XCB error: %d (%s), sequence: %d, resource id: %d, major code: %d (%s), minor code: %d",
and in plasma5 users in practice end up seeing this in their logs... a lot. See also,
It would be nice if this logging supported,
so that these items could be more easily filtered.