@MNLipp, Hm, so to clarify: for you there is a problem when both the
host and the guest are 12.04 (for me this did work and I only saw the
crash when the host was running Natty (11.04)). Do you get to the
lightdm login or does your crash happen sooner? Since for Mirto and my
testing it was possible to pause at the login screen, it is possible to
"sudo strace -s160 -p <pid of qemu-kvm> -f -o strace.txt" to catch the
kvm crash.

It seems to be all about virtual resolution. Mirto said 800x600 is ok...
So would that mean that you can bring up the guest with the cirrus card
and set the resolution to that, you can boot with vmvga? It would be
interesting to know whether this always works. And then which
resolutions are offered running with vmvga to change into? Are all
higher resolutions problematic or just certain?

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https://bugs.launchpad.net/bugs/987715

Title:
  In KVM In a virtual machine, system crashes if vmvga video card is
  used

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