@Gooral
I had a similar issue and found out, that MMM-PIR-Sensor and MMM-Remote-Control uses different commands for sleep/wakeup of monitor.
MMM-Pir-Sensor:
vcgencmd display_power 0
vcgencmd display_power 1
MMM-Remote-Control:
tvservice -p
tvservice -o
In my case i was not able to wake up the screen by PIR when i send him to sleep by MMM-Remote-Control and the way back.
Maybe this information helps.
AxLED