Comment 16 for bug 1782852

The computer that I can't reproduce it anymore is a 8 year old, so possible because I can open a lot of projects.

$ lspci -vnn | grep VGA -A 12
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
 Subsystem: Dell Mobile 4 Series Chipset Integrated Graphics Controller [1028:02aa]
 Flags: bus master, fast devsel, latency 0, IRQ 16
 Memory at f6c00000 (64-bit, non-prefetchable) [size=4M]
 Memory at e0000000 (64-bit, prefetchable) [size=256M]
 I/O ports at efe8 [size=8]
 [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
 Capabilities: <access denied>
 Kernel driver in use: i915
 Kernel modules: i915

00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)
 Subsystem: Dell Mobile 4 Series Chipset Integrated Graphics Controller [1028:02aa]

The other one is a this year computer. Also Itel Graphics, I can post more informations and debugs after, but I am happy because now I have to open more than three project for reproduce the issue, before was always at the second 3D.
Basically both notebooks use the same software and OS distro (Ubuntu 16.04), the hardware is the same base (of course, new Intel processor and GPU) plus 1 external display (I don't know if this can affect this issue).