[Bug 229074] [acpi_ibm] [patch] Add support for Thinkpads Mic led

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229074

            Bug ID: 229074
           Summary: [acpi_ibm] [patch] Add support for Thinkpads Mic led
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: aliovx at gmail.com

Created attachment 194314
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=194314&action=edit
Add support for microphone led

The acpi_ibm kernel module does not have a syscall to control the microphone
led state (for example on x220 and x230 thinkpads). The attached patch adds a
dev.acpi_ibm.0.mic_led=0 (off) 1 (on) sysctl, the led is controlled using the
ACPI MMTS Object.

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