Devices Are Not Going into Standby on Power Off

In order for Control Center to put some devices into standby mode, you must have CEC enabled. Different brands may have a proprietary name for CEC. Please ensure that your particular CEC control is enabled on the devices. You can verify/change CEC settings in the setup menu of your devices (not in Control Center).

Manufacturer
 
CEC Feature Name
AOC E-link
Hitachi HDMI-CEC
LG SimpLink
Mitsubishi NetCommand
Onkyo RIHD
Panasonic HDAVI Control, EZ Sync or VIERA Link
Philips EasyLink
Pioneer Kuro Link
Runco International RuncoLink
Samsung Anynet+
Sharp

Aquos Link

Sony / Playstation

BRAVIA Link, or BRAVIA Sync (PlayStation: Control for HDMI)

Toshiba

CE-Link or Regza Link

Vizio

HDMI-CEC