Comment # 27 on bug 106225 from Jerry Zuo

The issue could get reproduced on 4.16.3, but not on 4.16-rc7. 

I've verified the commit a0f282dcdb1775cbcc0a151570fc01c0aae5ca0f (current top)
on amd-staging-drm-next without seeing the issue on Raven by having 20 times
bootup. 

Please give a try on that commit at your setup. Thanks.