Hi, I just happened to realize that this seems to be a really long term bug - maybe it never worked. I came by an older Ubuntu Report of the same issue.
See: https://bugs.launchpad.net/debian/+source/qemu/+bug/1254828 And based on the info there this might have been broken at least since it still was qemu-linaro 1.0.50-2012.03-0ubuntu2.1
