[deejay1@betty ~]$ xrandr -s 800x600
[deejay1@betty ~]$ xrandr --output LVDS --set PANEL_FITTING center
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  155 (RANDR)
  Minor opcode of failed request:  13 ()
  Value in failed request:  0x58
  Serial number of failed request:  19
  Current serial number in output stream:  20