[Bug 1308756] [NEW] VNC graphics issues on guest VMs after server host upgrade from 12.04 to 14.04

[Doug Smythies]

Public bug reported:

I upgraded my host server from ubuntu 12.04 to 14.04. Afterwards, none
of my desktop VM's worked (I haven't even tried the server VM's yet).
During login the VM's complained about being unable to detect the
graphics card (screenshot will be posted). Proceeding results in a
screen of jibberish (screenshot will be posted). The VM guest is
actually working fine, and I can SSH into it. I made a new guest VM
using the exact same "virst-install" command I had used for the original
VM creation on the 12.04 host server, and compared the resulting .xml
file. There were 3 or 4 differences, but this one:

<type arch='x86_64' machine='pc-1.0'>hvm</type>

in 14.04 became this:

<type arch='x86_64' machine='pc-i440fx-1.7'>hvm</type>

I used "virsh edit" and changed that line and the guest VM originally
created under a 12.04 server host then worked under the 14.04 server
host.

Note: So far, this change has been made to 6 VM's (5 are either 14.04
originally or as upgraded from 13.10, and one was a 12.04 Desktop guest
VM) and 5 of them are now working. The one is only not working for one
log in type out of 5 possible (GNOME; GNOME Classic; GNOME Flashback
(Compiz); GNOME Flashback (Metacity); Ubuntu (Default)).

I use both TightVNC viewer and UltraVNC viewer from a windows computer
for this work, and have both viewers for this particular issue.

I use both vmvga or default (cirrus) video, and have tested both for
this issue.

Typical VM creation command:

sudo virt-install -n desk_tt -r 8192 --disk
path=/media/newhd/desk_tt.img,bus=virtio,size=50 -c trusty-desktop-
amd64-20140224.iso --network bridge=br0,model=virtio --video=vmvga
--graphics vnc,listen=0.0.0.0 --noautoconsole -v --vcpus=4

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

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https://bugs.launchpad.net/bugs/1308756

Title:
  VNC graphics issues on guest VMs after server host upgrade from 12.04
  to 14.04

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