  We establish the existence and uniqueness of strong solutions to stochastic
porous media equations driven by L\'{e}vy noise on a $\sigma$-finite measure
space $(E,\mathcal{B}(E),\mu)$, and with the Laplacian replaced by a negative
definite self-adjoint operator. The coefficient $\Psi$ is only assumed to
satisfy the increasing Lipschitz nonlinearity assumption, without the
restriction $r\Psi(r)\rightarrow\infty$ as $r\rightarrow\infty$ for
$L^2(\mu)$-initial data. We also extend the state space, which avoids the
transience assumption on $L$ or the boundedness of $L^{-1}$ in
$L^{r+1}(E,\mathcal{B}(E),\mu)$ for some $r\geq1$. Examples of the negative
definite self-adjoint operators include fractional powers of the Laplacian,
i.e. $L=-(-\Delta)^\alpha,\ \alpha\in(0,1]$, generalized Schr\"{o}dinger
operators, i.e. $L=\Delta+2\frac{\nabla \rho}{\rho}\cdot\nabla$, and Laplacians
on fractals.
