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

[Ryan Beisner]

Add'l input from my environment:

I recently upgraded one of my two local hosts from Precise to Trusty,
containing a dozen or so guests, including Ubuntu Precise, Trusty,
CentOS, and a Windows guest.  I had to adjust the machine types in the
XML definitions after the upgrade.  Other than that, these guests have
all been stable and happy.  Granted, I generally don't use VNC/VGA to
access them, so our scenarios are a bit different in that.

As a quick check, I just tested using VNC (Vinagre client) from my
Precise desktop to the Trusty-upgraded server that hosts about half of
my VMs.  The beloved Windows 8 GUI, LXDE and Openbox displayed
flawlessly for me.  Display and responsiveness on these was normal.

On the Trusty guests with XFCE, Gnome, and Gnome classic, there were
some odd video artifacts and screen drawing issues over the qemu vnc
head.  I expect this is due to things like gpu acceleration and other
fancy gui features, but that may require some more research.

Next, I can hop on a Win 7 laptop and test VNC performance to a couple
of those Trusty-hosted VM heads.

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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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