[arnold.maderthaner]

Take a look at the openbox startup script. There is one xset command that worked of the 500000+ guys that used the howto.

I changed it to the following but still have the issue (also upgraded to ubuntu 18.04) when I playback a movie and pause it using Plex for Kodi:

#
# These things are run when an Openbox X Session is started.
# You may place a similar script in $HOME/.config/openbox/autostart
# to run user-specific things.
#
OUTPUT=`xrandr -display :0 -q | sed '/ connected/!d;s/ .*//;q'`
xrandr -display :0 --output $OUTPUT --set "Broadcast RGB" "Full"
xsetroot #000000
xset s off -dpms
xset q >  /tmp/xxxxxx

# If you want to use GNOME config tools...
#
#if test -x /usr/lib/x86_64-linux-gnu/gnome-settings-daemon >/dev/null; then
#  /usr/lib/x86_64-linux-gnu/gnome-settings-daemon &
#elif which gnome-settings-daemon >/dev/null 2>&1; then
#  gnome-settings-daemon &
#fi

# If you want to use XFCE config tools...
#
#xfce-mcs-manager &
hsetroot -solid black 

also happens if I'm outside of the plex add-on and only have kodi running. Pressing a key on the keyboard reactivates kodi and I can continue using it (but normally I don't have a keyboard connected).
any other ideas how I can get this sorted out ?
here the current output of xset q:

Keyboard Control:
  auto repeat:  on    key click percent:  0    LED mask:  00000002
  XKB indicators:
    00: Caps Lock:   off    01: Num Lock:    on     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:  660    repeat rate:  25
  auto repeating keys:  00ffffffdffffbbf
                        fadfffefffedffff
                        9fffffffffffffff
                        fff7ffffffffffff
  bell percent:  50    bell pitch:  400    bell duration:  100
Pointer Control:
  acceleration:  2/1    threshold:  4
Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  0    cycle:  600
Colors:
  default colormap:  0x20    BlackPixel:  0x0    WhitePixel:  0xffffff
Font Path:
  /usr/share/fonts/X11/misc,/usr/share/fonts/X11/Type1,built-ins
DPMS (Energy Star):
  Standby: 600    Suspend: 600    Off: 600
  DPMS is Disabled