Problems with µ, displaying ţ with sisetup option (for combination of siunitx, fontspec and kpfonts)

Question

I have problems with the combination of using siunitx and displaying upright partial derivative symbols using:

\usepackage[partialup]{kpfonts}

The unit prefix µ is not displayed using this code:

\documentclass[preview]{standalone}
\usepackage{fontspec}
\usepackage[T1]{fontenc}
\usepackage[partialup]{kpfonts}

\usepackage{siunitx}

\begin{document}
\SI{1}{\micro\meter}
\end{document}

Adding the line

\sisetup{math-micro=\text{µ},text-micro=µ}

as mentioned on this board will display a ţ instead of a µ.

I've no idea how to solve that problem and would aprecciate your help.

Answer 1

This seems to work. The primary/only relevant? change is explicitly setting math-micro to \mu via \sisetup

\documentclass{article}
\usepackage{fontspec}
\usepackage[T1]{fontenc}
\usepackage[uprightgreeks,partialup]{kpfonts}


\usepackage{siunitx}

\sisetup{
    math-micro = \mu,
 }

\begin{document}
    \SI{1}{\micro \meter}

    \SI{1}{\micro \gram}

    \SI{1}{\kilo \gram}

    \SI{1}{\nano \gram}

    \si{\gram}

    \begin{equation}
    \frac{\partial Q}{\partial t} = \frac{\partial s}{\partial t} % just testing the partial ups
    \end{equation}

    \si{\micro \gram}
\end{document}

Answer 2

Considering Joseph Wright's comment I tried to avoid \usepackage[T1]{fontenc}. This resulted in a warning for a undefined font shape due to the \usepackage[partialup]{kpfonts} command.

Looking for a solution without kpfonts I found the package unicode-math, which allows upright partial derivative symbols as well:

\documentclass{article}
\usepackage{fontspec}
\usepackage{amsmath}
\usepackage[math-style=ISO]{unicode-math}
\usepackage{siunitx}

\begin{document}
\SI{1}{\micro\meter}

$\frac{\symrm{\partial} Q}{\partial t}=\mu$
\end{document}

Hope, this solution will not effect other problems.