Also possibly relevant:
https://bugs.freedesktop.org/show_bug.cgi?id=81633
https://bugs.freedesktop.org/show_bug.cgi?id=85584
Also possibly relevant:
https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 81633
https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 85584