1. Dell Latitude 3520 connected to an external screen: alt+tab needed
2. Toshiba Satellite Pro C850-19W connected to an external screen: The grub menu is 'back' to pure text mode and it works again. This is an important improvement from the previous daily iso file (no longer completely black and alt+tab fixes the remaining problem of the live system) :-)
-o-
I think the same tweak(s), that was used with grub in the live session might help also when applied to the installed system to make it work in the old Toshiba.
New iso file:
1. Dell Latitude 3520 connected to an external screen: alt+tab needed
2. Toshiba Satellite Pro C850-19W connected to an external screen: The grub menu is 'back' to pure text mode and it works again. This is an important improvement from the previous daily iso file (no longer completely black and alt+tab fixes the remaining problem of the live system) :-)
-o-
I think the same tweak(s), that was used with grub in the live session might help also when applied to the installed system to make it work in the old Toshiba.