Can you try these commands.

pCP is using the vcgencmd display_power command rather than the
tvservice command.


Code:
--------------------
    tc@pCP:~$ sudo tvservice -s
  state 0xa [HDMI CEA (31) RGB lim 16:9], 1920x1080 @ 50.00Hz, progressive
  tc@pCP:~$ sudo tvservice -o
  Powering off HDMI
  tc@pCP:~$ sudo tvservice -s
  state 0x2 [TV is off]
  tc@pCP:~$ sudo tvservice -p
  Powering on HDMI with preferred settings
  tc@pCP:~$ sudo tvservice -s
  state 0xa [HDMI CEA (31) RGB lim 16:9], 1920x1080 @ 50.00Hz, progressive
  tc@pCP:~$ sudo vcgencmd display_power 1 2
  display_power=1
  tc@pCP:~$ sudo tvservice -s
  state 0xa [HDMI CEA (31) RGB lim 16:9], 1920x1080 @ 50.00Hz, progressive
  tc@pCP:~$ sudo vcgencmd display_power 0 2
  display_power=0
  tc@pCP:~$ sudo tvservice -s
  state 0xa [HDMI CEA (31) RGB lim 16:9], 1920x1080 @ 50.00Hz, progressive
  tc@pCP:~$
  
--------------------


As a work around, if "sudo tvservice -o" works add it to a User Command.


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