Flatcar arm64 running on QEMU (kvm enabled) does not have video output when using VNC #1030
Description
I am trying to run a flatcar arm64 image on qemu-kvm (accel = kvm) with VNC console configured - VNC console just shows "Display output is not active" after the grub2 boots the kernel.
With Flatcar (tried every release channel flatcar_production_qemu_uefi_image.img.bz2), I see the bootloader menu - grub version 2.02, then the boot process seems to continue as expected -- but the VNC console just shows "Display output is not active".
This looks to be a Linux configuration issue, anyone happen to know what are the missing flags or maybe I can try a special linux cmdline param to test?
For example, Ubuntu works with no issues (so there is not a problem on my setup).
I have seen that in your flatcar_production_qemu_uefi.sh script, you are suggesting to run with -nographic, which works great for its purpose, but I would like to use VNC.
Here are the reproduction steps (on an Ubuntu 22.04 ARM64 AMPERE ALTRA):
# under root
dd if=/dev/zero of=flash0.img bs=1M count=64
dd if=/dev/zero of=flash1.img bs=1M count=64
# tried with the flatcar provided bootloaders, same issue. secureboot was disabled.
dd if=/usr/share/qemu-efi-aarch64/QEMU_EFI.fd of=flash0.img conv=notrunc
wget https://lts.release.flatcar-linux.net/arm64-usr/current/flatcar_production_qemu_uefi_image.img.bz2
bzip2 -d ./flatcar_production_qemu_uefi_image.img.bz2
qemu-system-aarch64 -smp 4 -m 4096 -k en-us \
-device usb-ehci -device usb-kbd -device usb-mouse -usb \
-netdev user,id=vnet,hostfwd=:127.0.0.1:0-:22 -device virtio-net-pci,netdev=vnet \
-drive file=flatcar_production_qemu_uefi_image.img,if=none,id=drive0,cache=writeback -device virtio-blk,drive=drive0,bootindex=0 \
-drive file=flash0.img,format=raw,if=pflash -drive file=flash1.img,format=raw,if=pflash -cpu host \
-object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 \
--vnc 0.0.0.0:1 \
-machine virt,accel=kvm,gic-version=host -device virtio-gpu-pci