Created attachment 104066 [details]
glxinfo

When I enable the shader modpack in minecraft my computer locks up: keyboard
does not react and screen has dark/light gray stripes.

You need to install forge and those two mods in order to reproduce the bug:
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1286604-shaders-mod-v2-3-18-updated-by-karyonix
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1280299-sonic-ethers-unbelievable-shaders-v10-1

I tried it without DPM, without HyperZ and without both, but the lockup didn't
change.

I am using Gentoo:
- with kernel 3.14.14 and mesa 10.2.4, the screen started flickering (on/off,
on+black/on) and locked up eventually.
- with kernel 3.14.15 and mesa 10.2.5 it immediately locks up and leaves me
with gray stripes.