When you plug in your headphones to the actual headphone jack. How does dingux react to this? Does the hardware disable the internal speakers or does dingux disables it?
He disables automatically the speakers, I think it's a hardware detection because works in every program, emulator, OS, menu and most important, works even when a bug happens.
My personal solution to the matter was open the dingoo and insert a aluminium foil with a little of paper glue(you can use another kind of conductor to close the same circuit, but the aluminium foil is flexible and really easy to work) to close the circuit between these 2 connectors:
This solve everything, the speakers keep mute foverer and I can use the 2 headphone input normally, if you do want the speakers again, just open the dingoo and remove the piece of aluminium.