This is a crosspost from MSE since I haven't found an answer there yet.

I am not very familiar with modular representation theory or Brauer theory yet, however lately I have needed to use $\mathbb{F}_p[G]$-modules for constructing counterexamples. Right now I am just making them in Magma, but I am looking to understand what I'm doing a little better.

Say that I am given a group $G$ which I would like to act on an elementary abelian $p$-group $E$ so that a prescribed proper subgroup $H\leqslant G$ acts fixed point freely on $E$, with $|H|$ and $p$ coprime. So, I construct an absolutely irreducible $\mathbb{F}_p[G]$-module with a trivial fixed point space under restriction to $H$. Often I have other subgroups which I would explicitly like to *not* act fixed point freely on $E$ (usually faithfully or trivially) in which case I also insist the module have a nontrivial fixed point space under restriction to those subgroups.

I am trying to figure out how to determine the smallest dimension of such a module - in other words, I want to know how big $E$ has to be. Obviously this is going to depend on the structure of $G$, and in particular the structure of $H$. **Which group properties determine this, precisely? Does anyone know where I could read about this specifically?**

There is some existing theory. For example, one can prove that if $F$ is a Frobenius group with cyclic complement $C$, and $F$ acts faithfully on an elementary abelian $p$-group $E$, then $|C|$ divides the minimum dimension of $E$ over $\mathbb{F}_p$. Are there more general results?