https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229969
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: [email protected]
Reporter: [email protected]
Created attachment 195378
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195378&action=edit
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 the
mixer.
The attached patch solves the problem.
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