Operating system: Xubuntu 17.10
GPU: Nvidia Geforce GTX760
Broken: 2.79, 2.79a, 2.80
**Short description of error**
Hard to descript by words, so I've made the video: https://youtu.be/rJbKQp4yle4
This problem is observed both in 2.79 and in 2.79a release candidate. The problem does not depend on render engine selected.