Warnings with beamer class and itemize

I'm getting the following annoying warnings:

LaTeX Font Warning: Font shape OT1/cmss/m/n' in size <4> not available
(Font)              size <5> substituted on input line 16.

...
LaTeX Font Warning: Size substitutions with differences
(Font)              up to 1.0pt have occurred.


I tryed to reduce the a minimal working example as much as possible:

\documentclass{beamer}
\usepackage{textcomp}
\useinnertheme{circles}
\useoutertheme[subsection=false]{miniframes}
\usecolortheme{seahorse}

\begin{document}

\begin{frame}
\begin{itemize}
\item bla
\end{itemize}

\end{frame}

\end{document}


Any ideas how to resolve that?

-
Have a look at tex.stackexchange.com/questions/14425/… – lockstep Nov 26 '12 at 12:53
Thanks! The number of warnings can be reduced with that method. I edited my minimal example and the warnings. – joachim Nov 26 '12 at 12:59

To completely remove those warnings, you should

1. load the textcomp package to provide the missing \textbullet symbol (as done in the edited version of your question);

2. use a scalable font like lmodern to provide a font size of 4pt.

\documentclass{beamer}

\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{lmodern}

\useinnertheme{circles}
\useoutertheme[subsection=false]{miniframes}
\usecolortheme{seahorse}
`