I just discovered, that the sensor is not usable after I resume from a "suspend to disk" (Fn-F12) but it is usable after a "suspend to ram" (Fn-F4) even if it wasn't usable before the "suspend to ram"
I just discovered, that the sensor is not usable after I resume from a "suspend to disk" (Fn-F12) but it is usable after a "suspend to ram" (Fn-F4) even if it wasn't usable before the "suspend to ram"