I want the opposite of what seemingly everybody else wants: on my plain old character mode tty1 console directly served by the video card of my bare metal Debian 8.10 Jessie box, I want the screen blanker to go to either DPMS "Suspend" or "Off". Whichever will kill the video signal that keeps my Acer monitor thinking there's something to display, therefore the monitor never truly goes to power save mode on that input.
I see many answers regarding Gnome and X-Windows, but this is not the windowing environment.
Plus, I want it to sleep/suspend/turn off rather than prevent this mode. See, the Acer monitor has 3 video inputs so I have the linux box feeding the DVI input (rarely looked at) while the DisplayPort comes from the desktop machine running some Brand-X operating system for 99% of my usage. But when my desktop sleeps, the Acer switches over to the DVI input from the linux box automatically, forcing me to switch the Acer monitor back to DisplayPort manually.
If I could get the linux box to shut off its video signal completely, the display would just go to sleep when both machines blank their video outputs and show my desktop machine's video when I wake it up. So far everything I've tried comes up a dead-end.
Debian 8.10 Jessie (about 1 week old)
Dell OptiPlex 980 (circa 2010)
ATI Radeon HD 4550 video card
systemd init system
Linux bcfs 3.16.0-4-amd64 #1 SMP Debian 3.16.51-3 (2017-12-13) x86_64 GNU/Linux