The little trick I found is to reduce the luminosity thanks to the F1 key, and then increase it again to come back to maximum luminosity thanks to the F2 key. I can see my desktop background and the login screen for 2s, and after that the screen becomes black (actually it really turns off, that's not backlighted black). When Internet Sharing is disabled, the computer goes to sleep and at lid opening, I don't have the problem described below. It behaves this way because I share my wired network connexion via Wifi ( System Preferences > Sharing > Internet Sharing).
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