Hi
Switch to the amdgpu driver;
zypper in xf86-video-amdgpu
Create a blacklist file for radeon;
cat /etc/modprobe.d/50-radeon.conf
blacklist radeon
Run mkinitrd to add the blacklist
mkinitrd
The fire up YaST Bootloader and add the following kernel options;
amdgpu.si=0 amdgpu.cik=1
This will blacklist the radeon driver and move to the amdgpu one. (I have a mullins R3 with Leap 15.3)
/sbin/lspci -nnk | egrep -A3 "VGA|Display|3D"
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R3 Graphics] [1002:9850] (rev 40)
Subsystem: Hewlett-Packard Company Device [103c:8305]
Kernel driver in use: amdgpu
Kernel modules: radeon, amdgpu