[Bug 1711358] Re: 20170817 - ISO hangs on boot on qemu with splash screen enabled and qxl graphics driver

[Jean-Baptiste Lallement]

It happens even if you start a VM directly with qemu from the command
line with the qxl driver (option -vga qxl) independently of virt-
manager.

For example, the following command will hang on boot:
/usr/bin/qemu-system-x86_64 -m 2G -smp 2 -localtime -no-reboot -cpu core2duo -enable-kvm -drive file=/tmp/disk.img,if=ide,media=disk -boot menu=on -soundhw all -display sdl -vga qxl -monitor stdio -cdrom /home/j-lallement/iso/ubuntu/artful-desktop-amd64.iso

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Title:
  20170817 - ISO hangs on boot on qemu with splash screen enabled and
  qxl graphics driver

Status in linux package in Ubuntu:
  Confirmed
Status in plymouth package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Test Case
  1. Boot artful desktop 20170817 under qemu with qxl
  2. Wait until ubiquity-dm is displayed

  Expected result
  It boots

  Actual result
  It hangs on the splash screen and the dots below the Ubuntu logo are not blinking. If the option 'splash' is removed from the boot command line it boots successfully.

  It also boots successfully with -vga std but in this case the splash
  screen is in text mode not graphical unlike with the qxl driver.

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