Swapping Radeon to AMDGPU kernel

Using an older hd 8490 and it defaults to the radeon kernel. Im trying to force it over to amdgpu but no instructions i can find line up. Theres no grub file in etc/default. Theres no amdgpu.conf in modprobe.d . If i make the amdgpu.conf file and place it in there with

Options amdgpu si_support=1
Options amdgpu cik_support=1
Options radeon si_support=0
Options radeon cik_support=0

And reboot it doesnt seem to change.

I currently cant boot into gaming mode due to this. Im not sure if its related but I also need to re-enter my steam credentials everytime. Wether i reboot the machine or just close steam and reopen it in the same session.
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