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Date:      Sun, 22 Jul 2018 19:50:05 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 229969] mixer_info modify_counter not incremented when are changes made to the mixer
Message-ID:  <bug-229969-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D229969

            Bug ID: 229969
           Summary: mixer_info modify_counter not incremented when are
                    changes made to the mixer
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: aliovx@gmail.com

Created attachment 195378
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D195378&action=
=3Dedit
Increment the modify_counter when mixer_set is called.

>From  sys/dev/sound/pcm/mixer.c:70
/**
  * Counter is incremented when applications change any of this
  * mixer's controls.  A change in value indicates that persistent
  * mixer applications should update their displays.
  */

But reading the code, it is clear that this is not the case, and the counter
remains 0. It is enough to call m->modify_counter++ in mixer_set on line 327
for example to make persistent mixer applications work correctly. Currently
they have to poll for all mixer controls, even if no changes were made to t=
he
mixer.=20

The attached patch solves the problem.

--=20
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