Hi,
I have an nvidia graphics card which is different from what you have.
Maybe you will find an idea in what I did.
The lat time I install tumbleweed was earlier this week and the installer won’t succeed without the nomodeset in the kernel lines. After the installation was finished, I installed all the requirements for installing the nvidia driver (in my case the .run file). I removed the nomodeset line in kernel parameters, blacklisted nouveau, do ldconfig then mkinitrd, then reboot to init 3 and installed the nviia driver.
In your case find or search the necessary requirement for your graphic card so it can run smoothly without the nomodeset.
For sure there are people here that is using similar to yours and one of them might be able to help.
The farthest along it has gotten is about 27 secs in, and amdgpu appears to load ok. That was removing quiet and removing silent, no append of plymouth.enable=0
Error message then was
systemd-journal[247]: Received SIGTERM from PID 1 (systemd)
What should I try next? Thanks for your help on this.