I believe Realtek's set of options is different depending on the chip. Was the machine you saw a 752VL? Front panel detection has been an option on desktop systems but jack detection hasn't been a toggle on any laptops I've owned. I've seen laptop speakers stay on but only when the driver was improperly installed.
You may need to try a different version of the driver. If Realtek has a newer one for your chip on their website it might have different options. Otherwise you'll have to look for a registry hack for disabling Realtek jack detection.
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