  We consider asymptotically-AdS $n$-dimensional black brane solutions in a
theory of gravity coupled to a set of $N$ $p$-form field strengths, in which
the field strengths carry magnetic charges. For appropriately chosen charges,
the metrics are isotropic in the $(n-2)$ transverse directions. However, in
general the field strength configurations break the full Euclidean symmetry of
the $(n-2)$-dimensional transverse space. We then study the linearised equation
for transverse traceless metric perturbations in these backgrounds, and by
employing the Kubo formula we obtain expressions for $\eta/S$, the ratio of
shear viscosity to entropy density. We find that the KSS bound on the ratio
$\eta/S$ is generally violated in these solutions. We also extend the
discussion by including also a dilatonic scalar field in the theory, leading to
solutions that are asymptotically Lifshitz with hyperscaling violation.
