I have several Dell Latitude 7490 i7-8650U FHD laptops.

When I install the latest 15.4 DVD - everything works until I do the updates,
when I reboot, the GUO comes up for about 45 seconds and the caps lock flashes
and the laptop is dead.

I have got it working by adding i915.modeset=0 to the startup.

On some laptops this is not needed - they are all different build dates but
have the same display and nvme installed (NVME is WD Black 500GB).

Installed via generic desktop and selecting MATE desktop at the Software part
of the install - all are ext4 partitions.
256MB for /boot/efi
32gb for swap
464GB for /

I suspect a bug in the i915 code.