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Created attachment 942294 [details]
Corrupted screen

Description of problem:
Guest can be rendered incorrectly when width crosses a certain threshold. 

Version-Release number of selected component (if applicable):
On guest:
xorg-x11-drv-qxl-0.1.1-9.el7
xorg-x11-server-Xorg-1.15.0-27.el7.x86_64

On host:
qemu-kvm-1.5.3-73.el7.x86_64
spice-server-0.12.4-6.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Connect to the guest
2. Resize (fullscreen)

Actual results:
Screenshot

Additional info:
The display breaks when width crosses 1366, which is resolution of my laptops display, not sure if this is relevant in any way.

Ok, so. Had to give it another go, because the steps to reproduce aren't exactly clear. The thing is, it's not reproducible anymore. No packages were updated on neither client, guest or host. The only change that was done to the guest, was edited domain xml (added usb controller). 

However, back then, it was relatively easy to reproduce.

I have one external monitor connected to my laptop, which in this case served as a host.
The resolutions are 1920x1080 and 1366x768. 
When I started the guest and connected to it, switching to fullscreen usually ended in corrupted screen (it never returned to normal, as it usually does), until another resize.

So I tried resizing the window, and it failed when it reached the mentioned width, regardless of height/total area.

Maybe there were some other factors contributing to it, that I'm not aware of :(. Anyway, feel free to close as insufficient_data.

until there is a way to reproduce, and given the lack of details (logs etc) I think we should close indeed. feel free to reopen if it happens again.