@Serge Hallyn

Most definitely.

To check the missing graphics output:
1) Download any bootable iso for the sake of simplicity.
Let's assume it's Damn Small LInux: 
http://distro.ibiblio.org/pub/linux/distributions/damnsmall/dsl-n/current/dsl-n-01RC4.iso

2)Open Virt-Manager
3) Click Create New Virtual Machine
4) Enter something as name and select "Local Install Media"
5) Select the downloaded ISO image
6) On the storage setup screen, uncheck Enable storage
7) On the next screen, check Customize Configuration before install
8) Select cirrus in Video options, click Apply
9) Click Begin Installation -- here you go, you can see bios messages and 
everything

10) Stop the VM and click Show Virtual Hardware Details
11) Change video to vga and click Apply
12) Click Power On the Virtual Machine button
13) you get no bios messages and no graphics, although the system reacts to 
input and consumes cpu

This works with either SPICE or VNC display.

To chech whether QXL works:
1) Install some OS (like WinXP or something) using cirrus video in VM settings
2) Install the QXL driver in guest OS or make sure it already comes with it.
3) Change video to QXL in VM settings and reboot the guest OS.
4) You should not see any bios messages or anything for some time, then the 
guest OS loads the driver and screen output begins to work correctly.

Before 12.04 beta 1 bios messages and graphics output during boot were present 
regardless of Video settings in VirtManager.
I still have a strong suspicion that if BIOS boot messages are not visible, 
then the BIOS (seabios) itself is not working with the virtual hardware quite 
right.

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

Title:
  Black screen on guest with anything except Cirrus

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