I have a strange situation. My Ubuntu installation works fine when I plug in the laptop and boot into it. Everything works as it should. But, if I boot in without plugging the laptop, the whole screen turns black. I can't use my keyboard, so can't alt ctrl del. I think it's an issue with the Vega integrated graphics not being compatible or something. When I plug in, the Nvidia card kicks in and does stuff pretty good. Of course, this switching is based on my observations on Windows. I don't know if it's the same deal with Linux.
My Specs: Asus TUF FX 505 DT
Ryzen 5 3550H
Radeon Vega 8 Integrated Graphics + Nvidia GTX 1650
Windows on SSD and Ubuntu on HDD's 100 GB Partition (three partitions 30 / + 16 swap + 54 home) .
Both UEFI, fast-boot disabled. I did a minimal install with no third-party drivers.
before someone marks this as duplicate, please do note that I have issues only when NOT plugged in.