login in 17.10 as guest in KVM/Qemu fails and ends on a blank purple screen

[Videonauth]

Fresh set up VM in KVM/Qemu on 17.10 host and 17.10 guest.

After installation of spice-vdagent and reboot only login to blank purple screen.

Same happens when I not install spice-vdagent but change the resolution.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: spice-vdagent 0.17.0-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-18.21-generic 4.13.13
Uname: Linux 4.13.0-18-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.5
Architecture: amd64
Date: Fri Nov 24 05:55:54 2017
InstallationDate: Installed on 2017-11-17 (6 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: spice-vdagent
UpgradeStatus: No upgrade log present (probably fresh install)

[Christian Ehrhardt  (paelzer)]

Hi Videonauth,
so to confirm - you
a) reboot the guest
or
b) change resolution in guest
and due to that
c) the guest UI as displayed only as a blank purple screen?

Since you care/check the UI at all I assume you have a 17.10 Desktop guest.
Trying to reproduce ...

[Videonauth (videonauth)]

Yes i have KVM/Qemu running on 17.10 as host and 17.10 as guest. Installing 17.10 goes fine when setting the display from QXL to VirtIO and the VM boots up and show the screen in 1024 x 768 resolution all works. as soon i try to install spice-vdagent which changes the resolution to native or if i change the resolution by hand the whole thing gets a purple screen after login and no response further. the above dump files are created on the guest after such an occurrence
.

[Videonauth (videonauth)]

Related: https://askubuntu.com/q/983600 where another user has same problem with resolution change.

[Christian Ehrhardt  (paelzer)]

Steps:
- Took a fresh 17.10 system as KVM Host
- Install virt-manager for UI driven guests
- fetch 17.10 desktop iso to install from [1]
- change resolution - ok
=> I must admit that with wayland in the guest I always had slight issues like shaky mouse pointer tracking, but so far it didn't break
- reboot - this hang on reboot in the splash screen
I knew there were various issues upstream with qxl/spice + wayland.
So I changed to graphic virtio in virt-manager.
That made it boot again.
---
- install spice-vdagent in guest to trigger the bug
- change resolution - ok
- reboot - ok
---

Maybe you are affected by another kind of qxl/spice+wayland bug - and while I can't reproduce I wanted to ask if you could check if changing the video mode makes this work better for you?

If so it seems that the upstreams of all the related projects need some more time to clear out more corner cases - I found nothing I could easily do to fix it other than avoiding.

[1]: http://releases.ubuntu.com/17.10/ubuntu-17.10-desktop-amd64.iso

[Videonauth (videonauth)]

Yeah I'm not sure as well what this might be. I just did some testing here again too, installing and changing resolution worked after I had installed qemu-guest-agent. Did a reboot, still worked, did an install of spice-vdagend and boom nothing works after a reboot. Checked the integrity of my ISO installation medium and it is fine. I'm running on Xorg on the host and running on QXL for example does not want to play ball still, only VirtIO is working somewhat reliable here. Well as of now i have normal fullscreen resuolution. but thats it and the full resolution is somewhat wonky. :)

[Launchpad Janitor (janitor)]

[Expired for spice-vdagent (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for qemu (Ubuntu) because there has been no activity for 60 days.]