[Qemu-devel] [Bug 1592315] Re: Windows 10 continuous screen refresh if resize guest to match window size is selected with QXL

[Laszlo Ersek \(Red Hat\)]

Please refer to the following tickets:

https://bugs.freedesktop.org/show_bug.cgi?id=94950
https://bugzilla.redhat.com/show_bug.cgi?id=1266484
https://bugzilla.redhat.com/show_bug.cgi?id=1342489

I can't deduce from the above whether it is a host side problem (spice-
gtk) or a problem with the VDAgent (= guest code, Windows and Linux),
but it's certainly not a QEMU bug. Closing.


** Changed in: qemu
       Status: New => Invalid

** Bug watch added: freedesktop.org Bugzilla #94950
   https://bugs.freedesktop.org/show_bug.cgi?id=94950

** Bug watch added: Red Hat Bugzilla #1266484
   https://bugzilla.redhat.com/show_bug.cgi?id=1266484

** Bug watch added: Red Hat Bugzilla #1342489
   https://bugzilla.redhat.com/show_bug.cgi?id=1342489

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https://bugs.launchpad.net/bugs/1592315

Title:
  Windows 10 continuous screen refresh if resize guest to match window
  size is selected with QXL

Status in QEMU:
  Invalid

Bug description:
  When VDA-Agent starts up, I get a continuous flicker of the screen.
  This is almost like a screen refresh, where I am not even able to
  really click on things and/or open menus.

  Running Windows 10, x64

  app-emulation/spice-0.13.1-r2::gentoo
  net-misc/spice-gtk-0.31::gentoo
  app-emulation/spice-protocol-0.12.11::gentoo
  app-emulation/qemu--2.6.0::gentoo
  nvidia-drivers-367.18
  xorg-server-1.18.3

  Kernel string:

  Linux wks-ros 4.4.11 #6 SMP PREEMPT Mon May 30 00:01:35 MDT 2016
  x86_64 Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz GenuineIntel GNU/Linux

  Launch string:

  SPICE_PORT=5924
  DRIVERS_IMG=media/virtio-win-0.1.118.iso
  SYSTEM_DISK=system.disk
  BIOS_ROM="OVMF.fd"
  DVDROM_DRIVE="/dev/sr0"
  VM_NAME="Windows 10 x64 VM"

  /usr/bin/qemu-system-x86_64 \
        -machine accel=kvm \
        -acpitable file="acpi_slic.bin" \
        -bios "${BIOS_ROM}" \
        -no-shutdown \
        -cpu qemu64,+ssse3,+sse4.1,+sse4.2 \
        -smp cpus=2,sockets=2,cores=1,threads=1 \
        -m 16G \
      -realtime mlock=off \
      -drive file="${SYSTEM_DISK}",if=virtio \
      -spice 
port=${SPICE_PORT},addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on
 \
      -chardev spicevmc,id=charchannel0,name=vdagent \
      -device virtio-serial-pci -chardev 
spicevmc,id=vdagent,debug=0,name=vdagent \
      -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 \
      -device qxl-vga,id=video0 \
      -device virtio-balloon-pci,id=balloon0 \
      -rtc base=localtime,driftfix=slew \
      -name "${VM_NAME}" & exec spicy --title "${VM_NAME}" 127.0.0.1 -p 
${SPICE_PORT}


  Some additional interesting things I've observed:

  * If the QXL driver is not installed, then the flicker doesn't happen
  * As soon as i enable the VDA Agent, the annoying flicker / screen refresh 
begins
  * When I disable the VDA Agent, same thing happens.

  - I tried Windows-Guest-Tools-0.100 and version 0.0103-r1

  - And an assortment of QXL drivers, (WDM, proper for Windows 10).

  
  As a workaround, I can set "Scale display" to On, and "Resize Guest to Match" 
to off (using Spicy-gtk). This stops the flicker.

  - Another strange thing is that I my XQL driver in Windows shows 8GB
  of Video mem. I am not sure how/why this is, as I have not seen this
  before.

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