System Information
Operating system: Linux-5.1.8-1-MANJARO-x86_64-with-arch-Manjaro-Linux 64 Bits
Graphics card: GeForce GTX 550 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.116
Blender Version
Broken: version: 2.80 Beta Linux 64 bit - July 19, 23:05:03 - c2e8e249acf9
Worked: Blender 2.79b (blender-2.79b-linux-glibc219-x86_64)
Short description of error
In official Blender 2.79b I can see my graphics card and use it for GPU rendering with CUDA... In newer versions it doesn't work anymore. Blender just says "No compatible GPUs found for path tracing. Cycles will render on the CPU"... this has been happening for months now in newer versions than the official 2.79b, I just hadn't the time to report it until now, sorry.
P.S.: I've checked the "list" of supported GPUs for Blender 2.80 and my GPU should still work. ( https://code.blender.org/2019/04/supported-gpus-in-blender-2-80/ )