[Bug 1913619] Re: qemu-system-x86_64 -cdrom -nographic gives no output

[Gerd Hoffmann]

The vga-to-serial redirection activated by -nographics works only for vgabios 
calls,
not for direct vga hardware access. grub2 uses the vgabios, the linux kernel 
doesn't.
You can edit the menu entry in grub and add "console=ttyS0" to the linux 
command line.

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

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https://bugs.launchpad.net/bugs/1913619

Title:
  qemu-system-x86_64 -cdrom -nographic gives no output

Status in QEMU:
  Invalid

Bug description:
  Running 'sudo qemu-system-x86_64 -m 2048M -cpu host -cdrom github
  /xvisor-bootable.iso -boot d -enable-kvm' will create a qemu window,
  boot to a grub prompt and then boot the xvisor binary correctly.

  Once I append -nographic to the command - after the user has selected
  the grub boot binary, there is no further output.

  I've tried various permutations with qemu options, but to no avail. It
  would be great to have this working as it will permit scrolling back
  up into the command history for reference and large data output.

  QEMU emulator version 5.2.50 (v5.2.0-925-g7b09f12773)

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