[Bug 194651] New: FreeBSD 10.1-RC3 audio hiss with powerd options on Elitebook 2530p

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194651

            Bug ID: 194651
           Summary: FreeBSD 10.1-RC3 audio hiss with powerd options on
                    Elitebook 2530p
           Product: Base System
           Version: 10.1-RC2
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: moertael at hotmail.com

I found one of the weirdest bugs in my life. It seems that powerd's options
cause hiss in the audio on my laptop. Here are the options from rc.conf:

powerd_flags="-n min -b min -a adp -r 90 -m 800 -M 2100"


and device.hints:

#turn off connections that don't seem to exist
hint.hdaa.0.nid18.config="conn=None"
hint.hdaa.0.nid26.config="conn=None"
hint.hdaa.0.nid28.config="conn=None"

#speakers
hint.hdaa.0.nid22.config="as=1 seq=0"

#headphones with auto switching
hint.hdaa.0.nid17.config="as=1 seq=15"

#build in microphone
hint.hdaa.0.nid21.config="as=2 seq=0"

#microphone jack with auto switching
hint.hdaa.0.nid20.config="as=2 seq=14"

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