Hello,
It unfortunately sounds like it.
The way Dell designed it is that the front jack will disable audio on DisplayPort and both HDMI outputs keeping the line out running. They call it headphone privacy.
The driver on your computer does not have an influence on which input is activated. If you have the sound on the back, it means the sound is routed correctly from the computer to the dock as this is a single source.
Kind regards,
Alban
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