I am using a Raspberry Pi to run an information display in an office.  I want the display in power save mode when outside of business hours.  I was going to use cron to execute something at the beginning and end of the day, but xset dpms force off doesn't work.  I have disabled the screen saver (so the display stays on during the day) with the addition of xset s off, xset -dpms and xset s noblank in the /etc/xdg/lxsession/LXDE/autostart file.Here are the results from xset q:Keyboard Control:  auto repeat:  on    key click percent:  0    LED mask:  00000000  XKB indicators:    00: Caps Lock:   off    01: Num Lock:    off    02: Scroll Lock: off    03: Compose:     off    04: Kana:        off    05: Sleep:       off    06: Suspend:     off    07: Mute:        off    08: Misc:        off    09: Mail:        off    10: Charging:    off    11: Shift Lock:  off    12: Group 2:     off    13: Mouse Keys:  off  auto repeat delay:  500    repeat rate:  33  auto repeating keys:  00ffffffdffffbbf                        fadfffefffedffff                        9fffffffffffffff                        fff7ffffffffffff  bell percent:  0    bell pitch:  400    bell duration:  100Pointer Control:  acceleration:  20/10    threshold:  10Screen Saver:  prefer blanking:  no    allow exposures:  yes  timeout:  0    cycle:  600Colors:  default colormap:  0x20    BlackPixel:  0x0    WhitePixel:  0xffffFont Path:  built-insDPMS (Energy Star):  Standby: 600    Suspend: 600    Off: 600  DPMS is DisabledUPDATE:xset s blank && xset +dpms && xset dpms force off will blank the display, but it doesn't put it in power save mode.  After reading a lot of threads, I still can't get the system time correct either (I think that may be a firewall issue)...
How can I put my HDMI display into (and out of) power save mode?
xorg;monitors;screensaver;raspberry pi