Lights in threejs doesn't work in some computers

Hello,

I am working with Qt and threejs. And directional lights does not work in my laptop (A Surface Pro 3 from Microsoft). I tested the equivalent version of threejs (r74) for a web application and directional lights worked perfectly. So, maybe the problem is Qt's JavaScript.

I attach screenshots of my computer specifications and of one of your examples: One Qt. This example has one ambient light and a directional one. In the picture you can see that the ambient light is working, but the directional light (which should be illuminating the main face of the cube) doesn't appear.

Any suggestions?

Regards.