Comment # 41 on bug 106258 from Michel Dänzer

Thanks for the report and help tracking down the problem. The fix is queued for
4.18, and will be backported to stable branches:

https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-fixes-4.18&id=38e624a18f9a05b8c894409be6b14709a7206c7c