[elrepo] Gnome black windows in Centos 7.6 after installing nvidia driver + bumblebee

[Juan Fumero]

Hi all,
   I recently updated from CentOS 7.5 to CentOS 7.6, and, when I reboot all
gnome Windows become black when I open them. I also did a fresh install and
I get the same problem, only after installing the NVIDIA drivers and
Bumblebee.

I have a laptop DELL XPS 15 with an NVIDIA GTX 1050M. I did not have any of
these problems with CentOS 7.5 or Centos 7.4. It also happens with a fresh
install (CentOS 7.6) after installing the nvidia drivers and optirun.

I am following the documentation here [1, 2] to install the GPU drivers and
then the bumblebee and primus.
[1] http://elrepo.org/tiki/tiki-index.php
[2] https://elrepo.org/tiki/bumblebee

As I mentioned, these instructions worked really well for CentOS 7.4 and
CenOS 7.5 but now I  cannot see any window in Gnome (the content of each
windows is all black). If I install KDE, everything works fine. Please, any
pointers will be appreciated. Is this bug? Any ideas of how I can continue
using Gnome without these problems?

I suppose I could install CentOS 7.5, but I do not know how to prevent
updates of CentOS 7.6.

Thanks,
Juan
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