Hmmm...
It works perfectly using the QEMU console you get by running "kvm" directly.
If I put "-k fr" or I run without a "-k" option, AltGR key combinations work as intended.
What doesn't work is typing AltGR combinations inside virt-manager viewer. So I guess it introduces a difference... There doesn't seem to be a simple way of forcing virt-manager to run kvm without a "-k" option, so I can't really test that. Note that the above kvm patch works around the libvirt viewer bug (but that may not be the appropriate way of fixing this bug).
Hmmm...
It works perfectly using the QEMU console you get by running "kvm" directly.
If I put "-k fr" or I run without a "-k" option, AltGR key combinations work as intended.
What doesn't work is typing AltGR combinations inside virt-manager viewer. So I guess it introduces a difference... There doesn't seem to be a simple way of forcing virt-manager to run kvm without a "-k" option, so I can't really test that. Note that the above kvm patch works around the libvirt viewer bug (but that may not be the appropriate way of fixing this bug).