Ubuntu 18.04 boot from external SSD, unable to detect laptop GPU

So I used to have a workstation which I assembled, with a Samsung 970 pro ssd, on which I installed and ran Ubuntu 18.04 perfectly.The workstation was a desktop, and the GPU was an NVIDIA TitanXp. Everything worked perfectly.

I ended up moving out of that workplace, but I kept the drive since that was of my own personal accord. I bought an external ssd enclosure, and decided that I could plug it into my ASUS ROG Strix laptop and boot my Linux drive and everything should work perfectly. It didn’t. While all system functions work perfectly, it doesn’t detect the GPU on my laptop. It just detects the Intel graphics. Is there a way I can get it to detect my laptop’s native GPU while booting it from an external SSD enclosure?