Comment 6 for bug 348364

There is a workaround:

1. Change a line in the virtual machines's XML file in /etc/libvirt/qemu/ from
<graphics type='vnc' port='-1' autoport='yes' keymap='en_us'/> to
<graphics type='vnc' port='-1' autoport='yes' keymap='de'/>

2. Restart the libvirtd daemon.

But a bug in virt-manager remains. This tool seems to be made for virtualization newbies like me who usually don't poke around in xml configuration files hidden from ordinary users. It would be preferrable if virt-manager asked for the desired keymap.

I still have the AltGr problem mentioned above, but that is another story.