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Audio Hardware Question from a Linux newbie
(sh.itjust.works)
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I'm not sure how to stop the DAC from shutting down when Mint goes to sleep, but maybe you can avoid the problem by making Mint not go to sleep in the first place? There's an option for it in the System Settings program, in the "power management" menu (under the "Hardware" heading).
Try doing that and see if the problem keeps happening. If it keeps happening, the DAC shutting down was probably caused by something else.