[Qemu-devel] [Bug 1336801] Re: 12.04 guest hangs on a 14.04 host server with cirrus graphics

[Stefan Bader]

The errors about the frame buffer device happen because grub is started in 
graphical mode and then the boot wants to replace the framebuffer device/driver 
while plymouth still holds it. I thought we should have fixed this before 
release by adding cirrus to the list of graphics that should get initialized 
late. So are people still having this issue with the latest updates?
A work around if this really still happens is to change /etc/default/grub and 
uncomment the console mode. Not ultimately nice but should be working.

** Changed in: qemu (Ubuntu)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1336801

Title:
  12.04 guest hangs on a 14.04 host  server with cirrus graphics

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  A new 12.04.4 server guest installation hangs on a 14.04 server host
  machine.

  I did the following:

  Created a new Virtual Machine with the Ubuntu 12.04 template using 
virt-manager
  Ran through the installation without a hitch to install a LAMP+SSH server. 
All standard options apart from that.
  On reboot the 12.04 guest started but then hung after doing fsck step.
  Trying different options (change disk driver, etc) made it progress a couple 
more steps but still hung.

  The thing that fixed it in the end was to switch to a VGA display
  driver, away from the default.

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