arm64 installer ISO stops the HDMI signal between GRUB boot and the Umbrel install script

[g-r-e-g]

ISO: https://download.umbrel.com/release/1.4.0/umbrelos-amd64-usb-installer.iso PC: CyberGeek Nano A1 Mini Desktop Computer, Intel 12th Alder Lake N100 (up to 3.4GHz), Mini PC 16GB RAM 2TB SSD monitor: various

I would get part way through the GRUB boot messages and the HDMI signal just stopped. I noticed it stopped in a similar part of GRUB boots where the monitor resolution bumps up and the monitor goes off and then on again with smaller, clearer text, but in this case, the monitor never got a signal back. The issue is described, along with the fix, here:

https://community.umbrel.com/t/installing-on-amd64-from-usb-and-hdmi-signal-drops-after-grub-boot/22443

The fix:

On the ISO, at /boot/grub/grub.cfg, there's a line that currently reads:

linux /vmlinuz root=LABEL=UMBRELINSTALLER ro quiet loglevel=0

and the installer works when it is changed to this:

linux /vmlinuz root=LABEL=UMBRELINSTALLER ro quiet loglevel=0 nomodeset vga=normal fbcon=font:VGA8x16