I suspect this is very much related to 680719 (upstream 1021649). If you disable the in-kernel irqchip, I bet you'll get your grub menu back. I experimented some with my guests that use -display sdl and the difference is quite noticable. For example, with an ubuntu server instance that has a grub timeout of 2 seconds, using kvm -machine accel=kvm,kernel_irqchip=on ... the grub menu flickers past without any delay on my workstation, but if use -machine accel=kvm,kernel_irqchip=off the 2 second countdown timer and grub menu behave as expected.
Marc, you'll want to review the above mentioned bugs and verify that your config matches; iow, that you're using a virtio-blk boot device. -- Jamie Heilman http://audible.transient.net/~jamie/ -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org