Artefacts with Eevee I try to learn Eevee and I noticed that I have a lot of artifacts in my viewport when I opened old projects. These artifacts can also be found in newly created scenes. 

When I render this scene, there are big "holes". Why is that? 
Is this a bug or is it due to my computer (I don't have a graphics card, just a laptop with Core i5 -7200U CPU)?
It's not the normals, they're correct.
It was a driver problem. The affected computer model is from the ASUS UX410 series. The Intel update refuses to install the new driver and refers to a customized driver from the manufacturer. However, the automatic update function of the manufacturer does not find the new Intel driver, but it is listed on the manufacturer's website. 

I installed the driver and the problem was fixed. There are no artifacts in the viewport now and the render is clean.