修改启动引导参数
vim /etc/grub.conf
quiet    后面添加    pcie_aspm=off
重启后
[root@localhost ~]# dmesg | grep PCIe
[    0.000000] PCIe ASPM is disabled

关闭tuned
systemctl stop tuned
systemctl disable tuned

配置 xorg.conf，且不能出错，否则系统可能会起不来，所以配置时要格外小心。
vi /etc/X11/xorg.conf
       添加以下内容
Section "ServerFlags"
       Option "BlankTime" "0"
       Option "StandbyTime" "0"
       Option "SuspendTime" "0"
       Option "OffTime" "0"
EndSection
Section "Monitor"
       Option "DPMS" "false"
EndSection
重启CentOS系统即可！