http://www.dokuwiki.org/tips:pdfexport:htmldoc returns an almost blank page. The error message (when I copy the raw wiki text into my private wiki):
Fatal error: Maximum execution time of 30 seconds exceeded in /path/to/dokuwiki/inc/geshi.php on line 1550
(but the line changes with each new try: 1573, 1547, 1570, 1549, ...)