Read my previous post carefully.
I do not at all said to deinstall
graphics/drm-kmod.
DEINSTALL
graphics/drm-515-kmod. Then, install
graphics/drm-61-kmod.
graphics/drm-510-kmod,
graphics/drm-515-kmod and
graphics/drm-61-kmod are conflicting each other and cannot be installed at the same time.
And possibly I've overlooked, but
graphics/drm-61-kmod builds only on
OSVERSION >= 1400508
.
This means it does not build on releases before 14.1.
To be precise, 5 or higher on digit at "hundred" means it's stable branch.
For 1400508, it's stable/14 before releng/14.1 is branched and newer than any of releng/14.0 branch. Currently, it's 1401501 when I'm writing this, becaise releng/14.1 branch is already created for 14.1-Release.