I'm on microcore 4.0, using Xorg-7.6 and Xorg-7.6-3d with an Intel graphics card. Running 3D programs works fine, but when they exit or are killed, X dies and the screen turns black except for the cursor (this occurs with at least glxinfo, glxgears, Minecraft); I have to hold the power button & restart to use the computer again.
If I load Xorg-7.5 and Xorg-7.5-3d instead of 7.6, everything runs fine.
lspci, glxinfo (under both 7.5 and 7.6) attached. Xorg.0.log didn't contain anything relevant.
Somewhat related: is there any big difference between Xorg-7.5 and Xorg-7.6? Am I missing out on anything important if I run 7.5 instead?
Completely unrelated: This site has the most (and the hardest) CAPTCHAs I've ever seen. Maybe I'm becoming a robot. ;-)