[Bug 242527] microphone on x1 carbon gen 7 does not work

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242527

            Bug ID: 242527
           Summary: microphone on x1 carbon gen 7 does not work
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

x1g7 has "4 x 360-degree far-field microphones" which apparently require DSP
support to be of any use.

>From Linux kernel bug 201251:
> The only way to enable DMIC support with HDA is to enable the DSP support.
> If you use the legacy HDaudio driver you will not be able to access the DSP.

https://bugzilla.kernel.org/show_bug.cgi?id=201251

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