There are a number of discussions on StackExchange on AMDGPU-PRO (such as (here) (1), (and here) (2)), but there seems to be a number of variables that can go wrong, and in my only case, none of the wires I found here or anywhere else could help me. In order to help other people who might follow my sad approach, I thought I should document this for posterity.
OS: Debian 10
GPU: AMD / Radeon rx580, also with Intel Integrated Graphics
I bought a GPU a long time ago with the hope of doing a bit of mining. I was a newcomer to programming and I did not really know how to make it work. She was there for a while. In light of recent material successes, I decided to try my old GPU. I've had the GPU running using (this) (3) wonderful tutorial that configures the GPU using Mesa. The test suite (and the noise) confirmed that the graphics processor was working. Yay! But I wanted to be able to exploit, and I quickly discovered that the extraction programs all used a different driver – AMDGPU-PRO. I thought it might not be too difficult and I downloaded the latest version (which might be important afterwards) from the AMD website.
The installation was not too difficult and I restarted.
I did not even have a splash screen.
I could tell that the computer was running because I had an external drive connected to a service system, and its relaxing flashing light meant that he was reading and writing as he was supposed to do it. Sometimes I got a loading screen that said things like:
( OK ) Started GNOME terminal...
But that would depend on the very example that I gave. I tried to connect to it blindly (in order to uninstall the drivers), but it did not work. The LED on my hard drive is not flashing at all, which makes me think that my keyboard controls were not working at all.
Starting in the BIOS menus will not show anything on the screen, although my external hard drive can not boot, I guess it would load the BIOS menu.
The classic wisdom is to keep SHIFT or ESC at startup to access a command line, but in my infinite wisdom, I use a wireless keyboard. I still have not gotten my hands on a PS2 keyboard, although I borrowed a USB keyboard and could not access GRUB with it.
I've thought of trying to boot from a live USB drive, but apparently, my BIOS does not give priority to USB boot. Good try.
So I was there, no screen, no keyboard. How to operate my computer? I tried IRC (from my other machine) and I was advised to erase everything and start over. Not that I'm sure how I would even get there.