Nope, the backlight is off. Only power button light becomes active, and the fans start spinning. Rest seems to be dead. If there are no logs of attempting to wake, the system is not woke at all, aside some peripherals.
Thanks for the tip with the Ethernet cable. Makes sense.
Anyway, if there are no surviving logs, either there are temporary logs that don’t survive hard boot, or the system really won’t try to wake, which means, I won’t get any data even via ssh.
The same suspend method is used on TUXEDO OS, and it works there, but it’s hard to compare because there is no mkinitcpio on Ubuntu systems. I may try to switch to S3, to check if there is a difference, thou.
Or maybe, I should consider switching to systemd boot? That can handle things differently. Or maybe systemd boot is enabled on TUXEDO OS? I have no idea. This is another topic to research.