Comment # 38 on bug 105684 from Alex Deucher

(In reply to jian-hong from comment #36)
> Created attachment 140806 [details]
> dmesg of 4.18.0-rc6
> 
> Tested with Linux 4.18.0-rc6 kernel.
> It seems the amdgpu module could be loaded correctly. I tried over 20 times.

Could you bisect to see what change fixed it?