Public bug reported:

No graphics output during boot when using qxl, vga, or vmvga in libvirt (kvm).
Cirrus graphics still work fine.

The bug is encountered through both VNC and SPICE.

Graphics output resumes when the guest OS loads its own VGA driver.

I'm using Ubuntu 12.04 and this bug is present in seabios 0.6.2-0ubuntu2
and 1.6.3 built from source.

Adjusting video memory allocation to a different (smaller) value does
not make any difference.

The bug was not present before some recent (~2 weeks) changes to related
virtualization packages.

** Affects: seabios (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/958549

Title:
  Black screen on guest with anything except Cirrus

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