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The next code produce a a6 format paper with pdflatex that fit well, but with lualatex the layout is a6 on a a4 paper sheet.
Passing a6paper option to geometry package doesn't solve the problem.
How have a correct papersize.
\documentclass[a6paper]{article}
\usepackage[margin=1.5cm]{geometry}
\begin{document}
Hello word !
\end{document}
Geometry has not been updated for the changes in lualatex (where they removed some \pdf... variables). Add this before \documentclass:
\RequirePackage{luatex85}
graphicx.sty and/or xcolor.sty before geometry.sty your MWE works as expected. Of course, you have to be using graphicx.sty and/or xcolor.sty in the first place ;)... (I use them practically all the time). So far, I have found no downside to this workaround.