Enable broken and dangerous selftests

configname: CONFIG_DRM_I915_SELFTEST_BROKEN

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>drm/i915 Debugging
└─>Enable broken and dangerous selftests
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option enables the execution of selftests that are "dangerous"
and may trigger unintended HW side-effects as they break strict
rules given in the HW specification. For science.

Recommended for masochistic driver developers only.

If in doubt, say "N".