多谢,我google了一下dpms和xorg.conf,结果找到网上说在ServerFlag里面增加下面的内容:
# Set the DPMS timeouts. These are set here because they are global
# rather than screen-specific. These settings alone don't enable DPMS.
# It is enabled per-screen (or per-monitor), and even then only when
# the driver supports it.