This turns out to be a mesa bug. I built a test package with the mesa from the upstream mesa bug referenced in the linked KDE bug:
KDE: http://bugs.kde.org/show_bug.cgi?id=241402
Mesa: https://bugs.freedesktop.org/show_bug.cgi?id=30220
I'll attach a debdiff in a bit.
This turns out to be a mesa bug. I built a test package with the mesa from the upstream mesa bug referenced in the linked KDE bug:
KDE: http:// bugs.kde. org/show_ bug.cgi? id=241402
Mesa: https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 30220
I'll attach a debdiff in a bit.