Black Screen after boot with GeForce RTX 2080 Ti
Try adding pcie_aspm=off and rcutree.rcu_idle_gp_delay=1 to kernel cmdline.
You could also try installing the latest drivers from the Nvidia website. I know this isn't ideal, but it might be an informative test: https://www.nvidia.com/en-us/drivers/unix/
However, this looks like a hardware failure. Take a look at https://github.com/wilicc/gpu-burn and https://github.com/ComputationalRadiationPhysics/cuda_memtest to test your GPU memory.