[Bug 1841202] [NEW] during install kernel console garbled when secureboot enabled

[Eric DeVolder]

Public bug reported:

Installing bionic, into an OVMF guest, with secure boot enabled (via kraxel EnrollDefaultKeys).
The GRUB screen works just fine, but as soon as the kernel boots, the "text" mode becomes garbled. One can tell that it is text, but it is wholly unreadable.

Installing from ubuntu-18.04.2-live-server-amd64.iso.

QEMU emulator version 3.1.0 (qemu-3.1.0-5.el7)
Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers

also happens on a qemu 2.5 version in Ubuntu 16.04 LTS

A rather vanilla qemu/kvm guest:

virt-install \
    --name vm2 \
    --vcpus 4 \
    --ram 8192 \
    --graphics vnc \
    --video vga \
    --network network=default,mac=52:54:00:00:00:02  \
    --cdrom=/root/bug29812426/work/isos/UefiShell.iso --check path_in_use=off \
    --disk=hda.qcow2 \
    --boot=loader=/root/bug29812426/work/vm2/OVMF_CODE-need-smm.fd,loader_ro=yes,loader_type=pflash,nvram_template=/root/bug29812426/work/vm2/OVMF_VARS-need-smm.fd  \
    --machine q35

What I expected to happen:
Text mode would be readable via the VNC session

What happened instead:
Text mode is corrupted/garbled/unreadable in the VNC session
See attached screengrab, which was taken post kernel boot and at the installer app.

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "2019-08-23-112200_800x625_scrot.png"
   https://bugs.launchpad.net/bugs/1841202/+attachment/5284229/+files/2019-08-23-112200_800x625_scrot.png

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https://bugs.launchpad.net/bugs/1841202

Title:
  during install kernel console garbled when secureboot enabled

Status in shim-signed package in Ubuntu:
  New

Bug description:
  Installing bionic, into an OVMF guest, with secure boot enabled (via kraxel EnrollDefaultKeys).
  The GRUB screen works just fine, but as soon as the kernel boots, the "text" mode becomes garbled. One can tell that it is text, but it is wholly unreadable.

  Installing from ubuntu-18.04.2-live-server-amd64.iso.

  QEMU emulator version 3.1.0 (qemu-3.1.0-5.el7)
  Copyright (c) 2003-2018 Fabrice Bellard and the QEMU Project developers

  also happens on a qemu 2.5 version in Ubuntu 16.04 LTS

  A rather vanilla qemu/kvm guest:

  virt-install \
      --name vm2 \
      --vcpus 4 \
      --ram 8192 \
      --graphics vnc \
      --video vga \
      --network network=default,mac=52:54:00:00:00:02  \
      --cdrom=/root/bug29812426/work/isos/UefiShell.iso --check path_in_use=off \
      --disk=hda.qcow2 \
      --boot=loader=/root/bug29812426/work/vm2/OVMF_CODE-need-smm.fd,loader_ro=yes,loader_type=pflash,nvram_template=/root/bug29812426/work/vm2/OVMF_VARS-need-smm.fd  \
      --machine q35

  What I expected to happen:
  Text mode would be readable via the VNC session

  What happened instead:
  Text mode is corrupted/garbled/unreadable in the VNC session
  See attached screengrab, which was taken post kernel boot and at the installer app.

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