I tried out this new
xeffects overlay. Apparently it comes with some patched kdelibs ebuilds. These things cause massive system breakage for me. Trying to start X and KDE fails with some kind of fatal IO error code 104. This is such a hard bug to figure out. It leaves no clue as to what's causing it. After a good half hour of screwing around with installing different version of
nvidia-drivers and re-installing Xorg, I thankfully remembered that this same exact thing happened to me before. I'm hoping that
rm -rfing the xeffects kde-related ebuilds and re-installing kdelibs is going to fix this.
This is the good thing about keeping a bare-minimum Gnome installed as a backup. However, ew. Gnome feels icky. I remember why I ditched it.