Clevo NS50AU suspend mode issue with keyboard and power led

I've just acquired a Clevo NS50AU with "i7-1360P" cpu powered by Ubuntu 22.04 and kernel 5.15

When in suspend mode :

• The keyboard remains illuminated
• The power led does not blink

I've searched on the Net but cannot found a solution, neither same question :-(

Thanks for diagnostic idea. Cheers.

[UPDATE 2023-12-03]

I've changed the suspend mode "s2idle" to "deep" with

echo deep | sudo tee /sys/power/mem_sleep

Now the keyboard light is off and the power led is blinking ... But after some seconds the laptop is powering off ... After switching on it reboots.