T1 encoding and font subsetting dont mix in dvips (?)

["Melissa O'Neill" <oneill@cs.sfu.ca>]

It seems that I've stumbled on a bug with font subsetting in dvips...

unix% cat <<END > utopian.tex
\documentclass{article}
\usepackage{utopia}
\usepackage[T1]{fontenc}
\begin{document}
\pagestyle{empty}
na\"{\i}ve was I
\end{document}
END
unix% latex utopian.tex
This is TeX, Version 3.14159 (C version 6.1)
(utopian.tex
LaTeX2e <1996/12/01>
(/usr/local/tex/texmf/tex/latex/base/article.cls
Document Class: article 1996/10/31 v1.3u Standard LaTeX document class
(/usr/local/tex/texmf/tex/latex/base/size10.clo))
(/usr/local/tex/texmf/tex/latex/psnfss/utopia.sty)
(/usr/local/tex/texmf/tex/latex/base/fontenc.sty
(/usr/local/tex/texmf/tex/latex/base/t1enc.def)) (utopian.aux)
(/usr/local/tex/texmf/tex/latex/psnfss/T1put.fd) [1] (utopian.aux) )
Output written on utopian.dvi (1 page, 220 bytes).
Transcript written on utopian.log.
unix% dvips utopian.dvi
This is dvips 5.70 Copyright 1997 Radical Eye Software (www.radicaleye.com)
' TeX output 1997.03.19:0211' -> utopian.ps
<texc.pro><8r.enc><texps.pro>. <putr8a.pfa>Error: '/idieresis' not found in reencoding vector <8r.enc> for <putr8a.pfa>
[1] 
unix% ... sigh ...

If one removes the ``\usepackage[T1]{fontenc}'', the problem mysteriously
goes away, as it does if one uses ``dvips -j0'' to disable font subsetting.

I've tried vainly to track the problem down, but alas no luck, since
`/idieresis' plainly is in 8r.enc.

Any idea of a fix would be greatly appreciated, source patches especially.

    Melissa.