I installed xfce4 on my laptop. It seems that the default setting is to show the screensaver, when the laptop lid is closed. The default setting for screensaver seems to be a random screensaver. I closed my laptop lid and expected that it sleeps. Instead, the screensaver was started and an OpenGL screensaver showed some molecules. This caused the laptop to run high CPU/GPU loads and as I have put it in a bag, it heated up dramatically. A notification would be good, even better it would be, that the default setting for closing the laptop lid is "sleep".
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