Xrandr doesn't work
, it lists one output (default) but xrandr --output default --off does nothing.
I don't want to use xorg.conf options because I need it to be switchable in runtime (eg when I shut the lid)
Quick and dirty solution seems to be to use xinput to disable mouse and then use xset dpms ... but I would like to avoid that.
There is also vbetool which works (vbetool dpms off) but when I turn the display back on (vbetool dpms on) something clashes somewhere (my guess: nvidia module) and I get complete lockout and need to restart the system