Re: [fedora-virt] 150 second timeout

I have a Fedora 15 x86_64 system, 8 GB of RAM, 4 CPUs, 1 terabyte disk.  I run several virtual machines on it, used to check cross-system compatibility of some software I develop for my employer.  I run "yum upgrade" on the host every work day, so it is up to date as of today (August 31). I have a RHEL 6.1 guest that I am using very heavily right now.  I run it with virt-manager.  The guest's disk is a logical volume with no (host) filesystem.  The guest's memory is drawn from a 1 GB hugetlbfs.  The host has a Nehalem CPU, which is exposed (to the extent possible) to the guest.  The display uses spice + qxl drivers in the guest. Recently, the guest has gotten stuck from time to time.  I'll be typing away and suddenly the guest's display will freeze.  When this happens, I can still use the mouse to perform functions on the host, but pressing keys has no effect.  Exactly 150 seconds later, the guest will unfreeze (sort of; see below) and I can change keyboard focus to other host applications again.  At that point, the guest window will *partially* repaint, but will still not change in response to mouse or keyboard actions.  I have to close that window and then click in virt-manager to open a new window.  At that point, I can see that all of the key presses I made while it was frozen were received and acted on by the guest, so it is only the display that froze. I have other Linux guests.  None of them display this behavior.  Is this some kind of incompatibility between the RHEL 6.1 qxl drivers and Fedora 15 spice?  Does a 150 second timeout ring a bell with anyone? Is there some way to get the keyboard focus away from the guest when this happens so I can at least do something useful on the host?