[Bug 1882851] Re: QEMU video freezes with "Guest disabled display" (virtio driver)

[Diego Viola]

OK, I was able to bisect, here is the result:

[diego@arch-zoom linux]$ git bisect bad
3954ff10e06e4fbc548fc02ff1fcaaac3228fed5 is the first bad commit
commit 3954ff10e06e4fbc548fc02ff1fcaaac3228fed5
Author: Gerd Hoffmann <kraxel@redhat.com>
Date:   Thu Dec 12 13:53:44 2019 +0100

    drm/virtio: skip set_scanout if framebuffer didn't change

    v2: also check src rect (Chia-I Wu).

    Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
    Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
    Link: 
http://patchwork.freedesktop.org/patch/msgid/20191212125346.8334-2-kraxel@redhat.com

 drivers/gpu/drm/virtio/virtgpu_plane.c | 35 ++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)
[diego@arch-zoom linux]$

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https://bugs.launchpad.net/bugs/1882851

Title:
  QEMU video freezes with "Guest disabled display" (virtio driver)

Status in QEMU:
  New

Bug description:
  I am using Arch Linux as my Guest and Host OS, after starting qemu
  with the following command:

    $ qemu-system-x86_64 -enable-kvm -hda arch-zoom.qcow2 -m 4G -vga
  virtio

  and waiting for a screen blank, I get this message:

    Guest disabled display

  And nothing happens after that, I can move the mouse or hit any key,
  and the message is still there.

  I can still reboot the VM but that's not optimal.

  I can reproduce this with the latest QEMU release (5.0.0) or git master, 
  I also tried this with older releases (4.0.0, 3.0.0) and the issue is still 
there.

  I can't reproduce this with other video drivers (std, qxl).

  With std/qxl the screen will blank a bit and then continue as normal.

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