How to load different version of radeon driver?

I successfully load the amdgpu driver with

$ cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt2)/vmlinuz-5.11.21-300.fc34.x86_64 root=UUID=bda68cec-a76d-4e6a-be52-fefcff9f76a6 ro rootflags=subvol=root amdgpu.dc=0 radeon.cik_support=0 radeon.si_support=0 amdgpu.cik_support=1

So it turns out A10-K7850K is using Sea Islands graphics instead of South Islands graphics.

Now my lspci -v reads:

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Kaveri [Radeon R7 Graphics] (prog-if 00 [VGA cont
	Subsystem: Gigabyte Technology Co., Ltd Device d000
	Flags: bus master, fast devsel, latency 0, IRQ 48, IOMMU group 0
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d0000000 (64-bit, prefetchable) [size=8M]
	I/O ports at f000 [size=256]
	Memory at feb00000 (32-bit, non-prefetchable) [size=256K]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [48] Vendor Specific Information: Len=08 <?>
	Capabilities: [50] Power Management version 3
	Capabilities: [58] Express Root Complex Integrated Endpoint, MSI 00
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
	Capabilities: [270] Secondary PCI Express
	Capabilities: [2b0] Address Translation Service (ATS)
	Capabilities: [2c0] Page Request Interface (PRI)
	Capabilities: [2d0] Process Address Space ID (PASID)
	Kernel driver in use: amdgpu
	Kernel modules: radeon, amdgpu

And GDM started OK.

Thank you very much for your continued support!