when helvetica is used in a QTextDocument for printing to a PDF then the font is rendered too small on Embedded Linux

If one reads an html file to a QTextDocument and have also set a helvetica font for the html document, then the pdf created shows the characters incredibly small.

The attached application can be used to reproduce the issue.

It has been tested on Qt 4.8.2 which was configured with:
./configure -debug -prefix . -nomake examples -nomake demos -nomake docs -embedded -qvfb -confirm-license

When you run the application via qvfb, the characters in the pdf are small.
This doesn't reproduce on desktop Linux (tested with Ubuntu 10.04)

If one removes the helvetica from test.html, the characters are displaying fine:

<style type="text/css">
   body {  font-family: Arial, Helvetica, sans-serif; font-size: small}
   h2 {  font-family: Arial, Helvetica, sans-serif; font-size: large; color: #A80F41}
</style>