This is because text returned by perldoc is no more POD, but is just plain text. For example: 
$ head /usr/share/perl/5.14/pod/perldoc.pod

=head1 NAME

perldoc - Look up Perl documentation in Pod format.

=head1 SYNOPSIS

B<perldoc> [B<-h>] [B<-D>] [B<-t>] [B<-u>] [B<-m>] [B<-l>] [B<-F>]
[B<-i>] [B<-V>] [B<-T>] [B<-r>]
[B<-dI<destination_file>>]
$ perldoc perldoc | head
PERLDOC(1)            User Contributed Perl Documentation           PE
+RLDOC(1)



NAME
       perldoc - Look up Perl documentation in Pod format.

SYNOPSIS
       perldoc [-h] [-D] [-t] [-u] [-m] [-l] [-F] [-i] [-V] [-T] [-r]
       [-ddestination_file] [-oformatname] [-MFormatterClassName]

[download]
Try perldoc -u <whatever> | pod2pdf instead (option -u makes perldoc show just raw Pod source).
Sorry if my advice was wrong.

In reply to Re: pod2pdf print blank page by aitap
in thread pod2pdf print blank page by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.