Comment # 2 on bug 1007746 from Michael Chang

Hi Ian,

Please help in adding kernel boot parameters into /boot/grub2/grub.cfg by
following the instructions below to see if any message can be logged.

If you are running on UEFI, adding the parameters to /etc/default/grub

  GRUB_CMDLINE_LINUX="debug ignore_loglevel earlyprintk=efi"

Or traditional bios:

  GRUB_CMDLINE_LINUX="debug ignore_loglevel earlyprintk=vga,keep

After the modification is done, run this command to update the boot loader
config file, /boot/grub2/grub.cfg.

  update-bootloader --refresh

Reboot and Test.
Thanks.