I'm out of ideas how to fix the problem, please my logs, I hope somebody can decode what could possibly be the underlying problem.
http://pastebin.com/DZq6jxXS
I'm not sure if I missed any kernel config, tried rebuilding glibc because a line tells me it segfaults there. Rebuilt xf86-video-intel and nvidia-drivers - still no luck. Re-emerge x11-drivers/* that I use, xorg-server, etc... still no luck.
Tried gentoo-sources too, still no luck. Hope someone can help.
I am stuck with 3.19 (debian-sources), however, I can't make my hdmi and displayports to work. xrandr -q does not report anything related to HDMI and DPs.