i'm using intel i3-2100 on a asus P8Z68-V PRO/GEN3 with 4g ram.the problem is mostly as same as this thread
i quote it here:"I just get a black screen with a blinking "_" in the top-left corner when I logout"
this situation happens occasionly,maybe one in 4 or 5 times.
i use xfce ,so i can't apply the method in this thread:
he uses kdm ,but i use startx to start xfce.
i use slackware-current. but the kernel is 3.7.10 ,i compiled and install it. i checked Xorg.0.log ,nothing happens special.