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0e1f616
(Get the code!)
After today's tests I think I understand more about the buggy behaviour in the Toshiba Satellite Pro C850-19W, when two screens are connected, the internal one plus an external screen via HDMI.
I tested the installed Lubuntu Noble system when the SSD was connected via a USB to SATA adapter. And it worked as it should all the way, also when the external screen was connected all the time including cold-boot and reboot.
I did some more tests this time by putting various SSDs inside the Toshiba, with a cloned live Lubuntu Noble system (standard with grub 2.12~rc), and a persistent live Lubuntu Noble system and an installed Ubuntu Server Kinetic (with grub 2.0.6). And it seems that whatever operating system is in the internal drive, it will not even get to the grub menu in BIOS mode, when the external screen in connected.
-o-
I should have tested this earlier, anyway now I think that there is a bug in the UEFI/BIOS system of the Toshiba, not a bug in grub or Ubuntu.
However, the original problem exists, that causes the flaky behaviour in UEFI mode in the HP Probook 640 G4. So I will re-focus on that problem and see if things can be made stable (repeatable).