That’s a good news, because I can try to fix it, even if it’s blindly. I tried
a lot of things I found on Internet to switch on backlight with no success.
The only final idea I had was: “I may try to restart properly the suspend
procedure”. So instead of trying to swith on the screen backlight, I tried to
suspend my computer in CLI because I suspected than my problem came from a bad
restart after the suspend.
The computer effectively suspended, the hard drive stopped, it works! Now,
typing space to restart it… and… magic! The screen came back to life.
However, first thing I tried is to close my computer then open it to check if it
works well. That’s a deception because, I’m back to my initial problem. Trying
to reboot it: same problem. This solution is only a temporary solution to debug
but the problem is still there.