xubuntu hdmi

chris@chris-X55U:~$ xrandr --output HDMI1 --set audio force-dvi
warning: output HDMI1 not found; ignoring
X Error of failed request:  BadRROutput (invalid Output parameter)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  15 (RRGetOutputProperty)
  Serial number of failed request:  28
  Current serial number in output stream:  28
chris@chris-X55U:~$ xrandr --output LVDS1 --off --output HDMI1 --set audio force-dvi
warning: output LVDS1 not found; ignoring
warning: output HDMI1 not found; ignoring
X Error of failed request:  BadRROutput (invalid Output parameter)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  15 (RRGetOutputProperty)
  Serial number of failed request:  28
  Current serial number in output stream:  28