Marek sent a series of patches to the mailing list that could be interesting to fix the black transition issue for Witcher 2: https://lists.freedesktop.org/archives/mesa-dev/2017-June/160177.html I sent a patch to the list enabling the drirc option for Witcher 2 and it seems to fix the black transitions problems for me: https://lists.freedesktop.org/archives/mesa-dev/2017-June/160291.html