Public bug reported:
Binary package hint: gnome-media
I often maximize volume on my PC in order to delegate volume control to
an external volume control wheel that speakers with amplifiers and some
headphones have.
The issue is that, maximizing the PCM volume on my laptop produces
crackling sound. The applet used to not touch this, so I always had this
at a fixed 80%, and only the Master volume setting was ever adjusted.
In Karmic, adjusting volume using the applet changes both PCM and
Master, and when maximized thus produces crackling sound.
My workaround options appear to be:
* Find the 'sweet spot' on the slider each time I do this. Tedious.
* Mix and mash the applet and external volume controls. Seems against the
'flat volume' principle.
* Maximize the external volume control and only use the applet. Produces
slight static.
* Resort to 'alsamixer -c0'. Which means giving up on the GUI.
Right now, I use the last of those workarounds, but none of these seem
optimal.
Some more background on that:
Interestingly, when adjusting the PCM volume in alsamixer, the system
seems to have some 'sweet spot' logic already built in. If I try to
lower PCM volume below 74%, it adjusts Master volume instead. This works
vice versa as well: adjusting volume from 0% up first increases PCM to
74%, then starts increasing Master to 100% before finally increasing PCM
again to it's full 100% volume.
Expected behavior would be a sane volume with no crackling when the
volume slider is set to maximum.
The driver I'm using appears to be snd-intel-hda, and lspci tells me:
Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev
03)
Some package versions:
gnome-media 2.27.90-0ubuntu1
pulseaudio 1:0.9.16~test4-0ubuntu6
alsa-base 1.0.20+dfsg-1ubuntu4
** Affects: gnome-media (Ubuntu)
Importance: Undecided
Status: New
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Cannot maximize PC volume without producing crackling sound
https://bugs.launchpad.net/bugs/414956
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