I reinstalled and I did some quick testing now.
This time my Aura HD had no problem rebooting.
Somehow I missed, that the frontlight must be set in the launcher settings. I was irritated, because of the "front light" entry in the CR menu, which has no effect, when I tap it.
When I set the value in the settings menu and then push the light button, it is working as it should! Very nice! Suspend is working, but the sleep.png does not show up.