So I've had this issue for like a year now but I'm reporting it now.
The RX570 8GB isn't displaying the Mobo splashscreen. But the CPU HDMI does.
I didn't have this issue for the first year or so after buying the GPU but it started showing up later.
I didn't really care because rarely do I have to access boot options or grub (Yes I am running linux).
Though that issue happened with windows too. (The MOBO splashscreen and the windows loading screen didn't show up)
And now this problem is really annoying.
How do I fix this?
Just on a side note: The shop I bought the GPU from closed down / was bought out by another one.
OS: OpenSuse (Linux)
Mobo: Z270-Gaming-K3 (GIGABYTE)
CPU: Intel i3-7100
GPU: RX570 8GB
Not many Linux users on this 'user to user' forum, as for Win.10 the usual fix is to turn off 'Fast Startup' in windows power plan.