Hi, all! I've dig into both Deep and shallow Web to solve this issue but no result so far.
Which means I've tried this much (though Jessie here long time back has been replaced by Buster so better call it Debian / Testing). Then this much to make Debian/Testing use Nvidia GTX 760 Ti as 3-D Graphic card.
Once I got lucky and after successfully installing Bumblebee package I got my 3-D Graphics up and running. Steam provided Witcher 3 looks marvelous in Debian! Soon afterwards my system got messed up by use of improper repository intended for Ubuntu by installing Signal messenger - my total stupid mistake! I just could not repeat the trick any-more. Each and every time I try to use Bumblebee it kicks me off normal re-boot-after-install process into Black Terminal with no other way round but hard reset and looped that process.
What I have is this piece of art:
Alienware X51 R2: standard base Windows 10 (64-bit), Home Edition in parallel with Debian-Buster 64-bit Dell Wireless 1550 (2x2 11ac combo with Bluetooth) NVIDIA GeForce GTX 760 Ti with 2GB GDDR5 330W AC Adaptor 4th Generation Intel(R) Core(TM) i7-4790 processor (8MB Cache, up to 4.0GHz) Slot-Loading Dual Layer DVD Burner (9.5mm) 256GB SSD SATA 6Gb/s +1TB 5400RPM SATA 3Gb/s 16GB Dual Channel DDR3 at 1600Mhz