Lamp shadow BUG

Hi friends!
Do blender 2.76b and 2.77a and buildbot have sun/Spot shadow bug?
When I check shadow, Sun/Spot get dark! So I can only use sun or spot without shadow.
Unfortunately Ubuntu 16.04 have 2.76b, an I need it for MORSE robotics.

May be a graphics card or driver problem.

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Here is snapshot:


I tested in blender 2.66 too and not differ!
It seems be a video card driver issue or …!
I tested on ubuntu 16.04, Arch linux, Arch linux rts 3.x kernel. Can anyone help me! Do it is a hardware problem or driver?
intel i915

I tested blender 2.66a in old ubuntu 10.10 (live cd) and get same result. but randomly have this shots:


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Have you been putting lots of shadow lamps in the scene lately, like 30 or more? I heard that can damage a GPU if you have a low end system.

No. My scenes have a little lamps.

When I run in blender-softwaregl, it is good. Is it a hardware crash?
LIBGL_ALWAYS_SOFTWARE=1 ./blender is good, too.