Sometimes, when people don’t fix headphone jack, speaker output go bye bye cause system think headphone jack on
If speaker output forced, people happi about speaker
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I read this in Luigi’s voice 
Both speaker and headphone jack use the same amp, the switch between outputs in this case is done physically in the jack, and is not done by the system.
Since the routing is not done via software, there’s no way to force the output to one or another.
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