[CentOS] video problem since 2015-04-01 update

Jay Warren wrote:
> I am getting the same problem as the OP but I am on nvidia.
I can confirm the problem on Nvidia GTX 750/760 with kmod-nvidia 346.47 
proprietary driver from elrepo. As a workaround you could try to set 
PowerMizer mode to maximum performance using nvidia-settings utility.

I am not sure if that related to OP, or if that relates to elrepo 
release, but it looks like the bug was introduced in update to 7.1.