[Gentoo] DisplayManager userland crashing, no displays

[mikopp]

# loaded module and verified
evdi 23854 0
drm_kms_helper 61022 2 i915,evdi
drm 233198 8 i915,evdi,drm_kms_helper
# ran ran DisplayManager as root, but the xsession was of course already running when I did that.
# connected displaylink via USB, lsusb shows its there
# connected the screen via displayport on the dock, roughly 10-20 seconds later crash.

This time I also see an edid file which represents the screen that I plugged in. part of log.zip