Comment # 8 on bug 108585 from Dan Horák

I should have mentioned I'm kexec-ing too. It's from 4.15.9 (in skiroot) to
Fedora kernels 4.16, 4.17, 4.18 and now 4.19 during the time. It worked fine
until the recent amdgpu firmware update. The skiroot kernel uses amdgpu
firmware from ~June.