Hello,
There is no option to activate with a black signal or just blanked. Audio isn't controlled separately from video as it would be a nightmare with docking stations having 4 video outputs + headphone + line out. There are also additional consequences on usability because of Windows asking to choose 1 output.
OEMs have even asked us to send back audio to the computer when all extended displays are disabled (analogue audio still being on the docking station).
Kind regards,
Alban
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