Thanks for the response. However, just in case there's a good reason they limit that driver to Ubuntu I'll keep this as a last resort effort. I did wonder if it would be worthwhile editing the xorg file, but I don't even know where to find the correct file let alone what to put in it.
It's frustrating that there's a hell of a lot of support on the AMD Radeon site to help with Windows and Ubuntu, but everyone else gets nothing. Heck, even a simple management program would be useful - at least nvidia did that right with a small management program to help detect monitors and cards etc.
Could you try downloading the Zorin OS 16 Beta and burning it to a USB (Rufus or Unetbootin... BalenaEtcher is Not Recommended) to make a Live Zorin USB.
Boot into it and test your Graphics on it?
If that works, it may point us in Two Possible Directions:
) Upgrade the kernel of Zorin 15.3 to a later kernel than is currently supported by Zorin 15.
I'm trying very hard not to have to do a reinstal. I suspect I could do a reinstal of 15.3 and fix the issue, but then I Have to go through and save all of my data and redo all of the personalised settings - I really don't want to do that if I can avoid it. But I may have to.
I know the feeling. I customize- A lot.
But, I also find it is never as bad as I dread it to be. You can back up your home directory, saving your customized configurations and settings.
I think we can first try the Live USB to test it graphics work on Zorin 16 Beta- and if they do - try installing a later mainline kernel like 5.9 or above, even.
According to the AMd Radeon website and the main Zorin website the card should just plug and play OK. However, I suspect the issue is I had an nvidia card in use until I swapped the cards earlier today. That's why I suspect I only need to find the right file and change a setting to have it recognise and work all 4 monitors OK. At the moment it only works the 1 monitor, and, of course, it had to pick the smallest one with the smallest font to use.
Not exactly, just the damned hardest to read due to it being my parking monitor so the font is very small as the monitor is small, I could set it to have a larger font or smaller resolution but then it messes up the windows etc, so I just squint at the dang thing. What's easy to read on the 42 inch monitor is damn hard on the 20 inch monitor.
Funny how everyone is walking around with their nose glued to a cell-phone, isn't it?
Yes, the AMD drivers really should work out of the box. I do wonder if your AMD graphics card is too new for the 5.4 kernel you are using...
Editing a grub parameter may help... for example;
sudo nano /etc.default/grub
Arrow key down to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
and add amdgpu.ssg=1 amdgpu.direct_gma_size=9 to the end. It should then look like:
just ran the amd-gpu program and it had an issue some dependencies and says there are brokne packages. I'm going to log off and reboot, and hopefully, be back soon with something working, otherwise I'll have to go the rebuild route. See later and thanks for the help, whatever happens.