[alsa-devel] amixer shows capability "penum" on every Simple mixer control

Takashi Iwai tiwai at suse.de
Tue Mar 13 10:52:21 CET 2012

At Mon, 12 Mar 2012 22:09:35 +0100,
Christian Esken (KDE) wrote:
>  Hello,
>  when I run amixer it shows the capability "penum" on nearly every 
>  Simple mixer control.
>  I posted the bug report 
>  https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5496 , but 
>  Raymond asked me to report it on this mailing list ("as it is related to 
>  this patch 6d511eefa05878abee9f8b9145697230de605200 Implements support 
>  for capture/playback enums.").
>  I posted  details for the following two examples in 
>  https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5496 :
>  1) "Creative X-Fi" does not have any Enum's. alsamixer does not show 
>  Enums's. amixer lists "penum" for ALL Simple mixer controls.
>  2) "HDA ATI SB" has no penum's, only 3 cenum's. alsamixer shows it 
>  correctly, but amixer disagrees and shows penum for NEARLY ALL Simple 
>  mixer controls (except for those with cpability "cenum").
>  I found this as I received several bug reports for KMix with "absurd" 
>  amixer output. I could perceive from those bug report that the bug is 
>  affecting a lot (or all?) sound cards.

Looks like a bug in alsa mixer abstraction, indeed.
Will take a look at it later.



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