Yes, I have nvidia, recent updates includexorg-x11-drv-nvidia-devel-352.39-1.el6.x86_64 Tue 08 Sep 2015 04:07:42 PM BSTxorg-x11-drv-nvidia-gl-352.39-1.el6.x86_64 ? ?Tue 08 Sep 2015 04:04:03 PM BSTxorg-x11-drv-nvidia-libs-352.39-1.el6.x86_64 ?Tue 08 Sep 2015 04:04:01 PM BSTxorg-x11-drv-nvidia-352.39-1.el6.x86_64 ? ? ? Tue 08 Sep 2015 04:04:00 PM BST So far I have failed to find a copy of the old centos rpm ? ?http://rpm.pbone.net/ points at a location that doesn't exist, So? I tried using the redhat rpm? xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64.rpm but the downgrade fails, is yum out of step with rpm ? as given # yum downgrade xorg-x11-server-Xorg-1.15.0-36.el6.x86_64 ./xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64.rpm Loaded plugins: auto-update-debuginfo, fastestmirror, refresh-packagekit, security Setting up Downgrade Process Loading mirror speeds from cached hostfile ?* base: mirror.ox.ac.uk ?* epel: mirror.nl.leaseweb.net ?* epel-debuginfo: mirror.nl.leaseweb.net ?* extras: centos.serverspace.co.uk ?* updates: centos.serverspace.co.uk No package xorg-x11-server-Xorg-1.15.0-36.el6.x86_64 available. Examining ./xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64.rpm: xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64 Nothing to do and omitting the last part of the rpm name # yum downgrade xorg-x11-server-Xorg-1.15.0 ./xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64.rpmLoaded plugins: auto-update-debuginfo, fastestmirror, refresh-packagekit, security Setting up Downgrade Process ... Examining ./xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64.rpm: xorg-x11-server-Xorg-1.15.0-26.el6_6.x86_64 Nothing to do [[alternative HTML version deleted]]