[alsa-devel] Laggy mixer with Xonar DX snd_virtuoso

Clemens Ladisch clemens at ladisch.de
Wed Apr 14 08:59:41 CEST 2010

Flávio Martins wrote:
> 2010/4/13 Clemens Ladisch <clemens at ladisch.de>:
>> Flávio Martins wrote:
>>> I have a Xonar DX with a laggy volume control, you might have guessed already.
>>> Sound will interrupt if the volume change is big like from 100% to 50%, it will only
>>> skip a bit if the volume change is smaller. The interruptions/silence last more than
>>> 5 seconds easily. I can actually see the mixer slider going up and down on its own.
>> Does this also happen with alsamixer?
> Controlling the volume with alsamixer works well, the sound does not break.
> If i change the volume with the gnome-applet/pulseaudio i can see the sliders
> in alsamixer getting affected by my changes with some stuttering and the sound
> does break as described initially.

Volume changes on the Xonar D1/DX need several milliseconds and thus are
relatively slow, compared to most on-board sound cards.  However, there
are other sound cards that behave the same.

It looks as if the gnome-applet saves all mouse moves and tries to
execute the volume changes for all intermediate positions even if the
mouse has already moved to the final position.  Please file a bug with 
that mixer.


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