Hello Guys, our cluster runs till 2014 on supermicro board. It is not unusual that still mainboards with mga graphics cards are delivered. So I have then adjusted the mga driver from centos 6 - the specification file - , to be build on CentOS 7. Since then this runs on the headnode without failures. Maybe you should provide this via epel. The source can be found here: http://centos.cms4all.org/repo/7/drivers/SRPM/xorg-x11-drv-mga-1.6.3-11.el7.centos.src.rpm This is the latest from Centos 6.9. Sincerely Andy