[Python] how to switch off/on a LCD connected to a RSPPI3B in python?

I first tried with cmd lines :

wlr-randr


it returns

SPI-1 "(null) (null) (SPI-1)"
Physical size: 73x49 mm
Enabled: yes
Modes:
480x320 px, 0.007000 Hz (preferred, current)
Position: 0,0
Transform: normal
Scale: 1.000000


then

wlr-randr --output SPI-1 --off


and again

wlr-randr


that returns :

SPI-1 "(null) (null) (SPI-1)"
Physical size: 73x49 mm
Enabled: no
Modes:
480x320 px, 0.007000 Hz (preferred)
NOOP-1 "Headless output 2"
Enabled: yes
Modes:
1920x1080 px (current)
Position: 0,0
Transform: normal
Scale: 1.000000


and

wlr-randr --output NOOP-1 --off


switches off the screen

but impossible to switch it on again


wlr-randr --output NOOP-1 --on


doesn't work. It displays a corrupted screen.

i read many many postgs in many forums

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