Red Hat Bugzilla – Bug 507626
qemu-kvm VNC :: major display tearing garbage with windows guest and scrolling windows
Last modified: 2009-07-20 04:43:13 EDT
Created attachment 349096 [details]
Screenshot of Windows XP running in a guest
Description of problem:
When running a (Windows XP) guest under qemu-kvm viewed using a vnc viewer it seems that the display is not updated properly when scrolling windows resulting in unreadable tearing and garbage being displayed. Screenshot attached. This is a regression from the F-10 packages where this problem was absent. I see the problem with both the vinagre and virt-manager vnc client.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Start a windows XP guest and connect via vnc
2.Scroll an application
Garbage on screen
No garbage on screen
Thanks, I suspect this is a dup of bug #503156, but I'll leave it open until we can confirm that for sure
Is there anything I can do to help debug this - this is a major problem, rendering guests pretty much useless for me.
What I've found so far:
* It is qemu-kvm specific - does not happen with -no-kvm
* It is cirrus specific - does not happen with -vga std
* It worked until kvm-83 - stops working at kvm-84
I'll keep debugging this.
Glauber posted a patch here:
Looks like it's confirmed as a dup of bug #503156, so marking it as such
*** This bug has been marked as a duplicate of bug 503156 ***