<QueryList>
      <Query Id="0" Path="Microsoft-Windows-PushNotification-Platform/Operational">
      <Select Path="Microsoft-Windows-PushNotification-Platform/Operational">*[System[(Level=4 or Level=0) and (EventID=1025) and Security[@UserID!='S-1-5-18']]] and *[EventData[Data[@Name='PowerEventType'] and (Data='MonitorSettingChange') and Data [@Name='IsEnabled'] and (Data='false')]]
      </Select>
      </Query>
    </QueryList>
  

@echo off
echo standby 0 | "C:\Program Files (x86)\USB-CEC Adapter\x64\cec-client.exe" COM2 -t r -p 1 -b 0 -d 1 -s
  rem   standby 0    Destination for standby command = 0 (TV)
  rem   COM2    COM port on PC = 2
  rem   -t r    Type of device to emulate = Recording Device (includes Playback Device functionality)
  rem   -p 1    Port on TV to use as active source = HDMI1
  rem   -b 0    Base (logical address) of TV = 0
  rem   -d 1    Debug level = 1 (show errors only)
  rem   -s      Single command execute, then exit
  rem   Script execution time is around 2.5 seconds
  

I use this tiny (13g) adapter as reliable solution for the typical scenario. When PC starts up, the adapter powers on the TV, and switches the TV's input to HDMI1. When PC shuts down, the adapter powers the TV off.

All I had to do to make it work is to install the latest version of libCEC by Pulse-Eight on GitHub, and follow the instruction «Turn on/off TV using USB-CEC Adapter (Windows Batch script)» published in FAQ section on Pulse-Eight web site.

The adapter also works in opposite way. If my PC is in sleep or hibernate state and I turn on my TV, the adapter wakes up the PC after 30 seconds, provided the HDMI1 source is selected on TV when it powers on. The same happens if I switch from watching TV to HDMI1 source (without 30 seconds delay). Don't know how to turn off this 'wake the PC' feature, though. By the way, when I power off the TV, the PC remains powered on.

My configuration:
ADAPTER — firmware v9, libCEC v4.0.3, recognized in Windows Device Manager as «Pulse-Eight USB to HDMI CEC Adapter (rev.2)», and for unknown reason as «HID-compliant mouse».
TV — Samsung SmartTV LT27H390S (PC monitor with built-in TV-tuner), supports CEC v1.4.
PC — Intel Core i5, Windows 10 x64 v1903.

The adapter supports CEC v1.4 (there is no difference between v1.4, v1.4a, and v1.4b in terms of CEC). It can emulate many CEC-types of devices: Recording, Playback, Tuner, Amplifier. It's even possible to emulate several types at once.

Hardware part is based on energy efficient AT90USB162 microcontroller. That's why the power consumption is less than 0.1W, and the box doesn't heat up.

Software part is based on Microsoft Visual C++ 2015 Redistributable Package (x86), and employs libusb-win32 when upgrading the firmware.

For those who experience any problems, here is a short troubleshooting list.
Ensure that the option «Anynet+ (HDMI-CEC)» is on (located in TV Settings => General => External Device Manager).
HDMI cable that connects adapter to TV supports CEC.
For 'power on' feature to work, the adapter may have to be physically connected to HDMI 1 port (not HDMI 2, etc).
Update the firmware and software of your adapter.

I would definitely give this device 5 stars, but it has some considerable drawbacks:
As many users have already complained, there are no clear documentation, such as User Guide or at least step-by-step Quick Start Guide instruction in PDF form.
It seems like the development of libCEC has stopped. No new version has been released from November 2018 to January 2020.
Powering on the TV wakes up the PC if «Allow this device to wake the computer» setting is cleared.
There are some functionality and usability issues with cec-client.exe and cec-tray.exe (both are part of libCEC software), but that's another story…

1. Python 3 ( 3.8.0-amd64).
2. ,
   pip3 install websocket-client
3. .zip samsungctl.
4. .zip .
5. __main__.py
   

   directories.append(os.path.join(os.getenv("HOME"), ".config")
           

   :
   

   home_dir = os.getenv("HOME")
   if home_dir:
       directories.append(os.path.join(home_dir, ".config"))
           

6. (elevated) ,
   python setup.py install
7. samsungctl.exe ,
   %LOCALAPPDATA%\Programs\Python\Python38\Scripts

MONITOR      3 Series, H Series
TV           M/MU/Q/LS/6 Series (2017 - Current, as of November 2019)
IP CODE      IP20 (protection from fingers or similar objects, no protection from water)
EDID         Revision 1.3
HDMI-CEC     Version 1.4
COLOR        Color space HDMI_RGB444

MAINBOARD
  CODE       BN41-02620A (CI slot label BN94-12200W)
  MODEL      BN41-02620; KANT_S(VERTICAL)_LED SIZE: 144.5X214mm 1 . 2T
  DATE       2017.06.16
  CHASSIS    88V0 94V-0 K058C-178A
  CPU        ? ARMv7
  EEPROM     24512FD ST K9358 512Kbit/64Kbyte 3.3V SO8N 150mil
  SPI        25Q40CSIG GigaDevice HE1935 A9A740 4Mbit/512KByte 3.3V 8-pin SOP 208mil
  eMMC       ? Samsung K4B4G1646E-BCNB DDR3-2133 SDRAM 4GB 1.5V 6th_Generation(Revision E) 96FBGA
  RAM        Samsung K4B2G0846F-BYMA DDR3L-1866 SDRAM 2GB 1.5V 7th_Generation(Revision F) 78FBGA - two chips
  LED PWM    S5014R
  AUDIO      TAS5747 (custom chip from Texas Instruments). The nearest analog recommended by TI is TAS5753
  SubMicom   ? (WT61P607 or S3F866B not found), version T-KTSINTV-1003
  TCON       None

LCD PANEL
  CY-MM270BNLV2V
  EG09BN9504513AS720M920070
  27A6LF2E
  2019.09.02
  MW36
  MADE IN EGYPT(SEEG)
  PIXEL FAULT CLASS III (the panel may contain from 5 to 50 defective pixels)
  PIXEL PITCH 0.311 mm

TUNER
  BN40-00330B
  190802  81C

WI-FI 802.11a/b/g/n, 2.4/5 GHz, without Bluetooth, 6-pins cable
  MODEL WIDT30Q
  BN59-01174D
  WSWLM210D00
  WCFHE210R  H00

POWER SUPPLY 48W/19V  2.53A  100–240 V 50/60 Hz 1.5 A  central plus
  BN44-00886D  R.L
  A4819_KSML
  REV 2.1