Sound problems: Is it caused by udev? (power_save=0 -> solved?)

MartinG gronslet at gmail.com
Fri Dec 12 22:33:48 UTC 2008


On Fri, Dec 12, 2008 at 3:26 PM, Chuck Anderson <cra at wpi.edu> wrote:
> This sounds like the power saving mode of the sound card is enabled.

This sounds very plausible indeed - if I play some sound using eg. aplay, I get
a "click" or "pop" the first time, but if I repeat it *immediately*,
there is no such hickup.
If I wait a minute (or so), and the play something, I do get a
click/pop/hickup right
 before sound starts.

I don't think I've got any custom made scripts for powersaving on the
sound card.
I did get some help on freenode (IRC), at #alsa and #pulseaudio and
they suggested
to disable powersaving for my sound card, but I was told my card probably didn't
support powersaving.

But
http://bughost.org/pipermail/power/2007-May/000266.html
suggested otherwise so I added "options snd-ac97-codec power_save=0" to
/etc/modprobe.d/my-sound and rebooted.

And now I can't notice any pop/click/hickup when I play sound anymore!
Yay!

If this really is the solution for all ac97 folks, I  suggest to make
this the default...


-MartinG




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