[9.10 regression] HDA power_save=10

Bug #452343 reported by Federico Pelloni on 2009-10-15
This bug affects 6 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

Binary package hint: pulseaudio

I'm using Karmic beta.

During boot and also when logged in, also before starting any application, I have cracking sound coming out of my speakers every some seconds.
More strange, if I switch off the speakers then I can hear the same cracks from the internal speakers (it's an HP laptop) even if the jack is plugged in. Seems like something electrical, but must be caused by some software problem as the problem is not present on Windows neither it was on Jaunty (though I switched off Pulseaudio, IIRC).

ProblemType: Bug
Architecture: i386
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 0/1
   Subdevice #0: subdevice #0
 /dev/snd/pcmC0D0c: fredp 4728 F...m pulseaudio
 /dev/snd/pcmC0D0p: fredp 4728 F...m pulseaudio
 /dev/snd/controlC0: fredp 4728 F.... pulseaudio
 Card hw:0 'Intel'/'HDA Intel at 0xde300000 irq 22'
   Mixer name : 'Conexant CX20549 (Venice)'
   Components : 'HDA:14f15045,103c30bb,00100100'
   Controls : 18
   Simple ctrls : 8
Date: Thu Oct 15 18:55:32 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: pulseaudio 1:0.9.19-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.31-14.46-generic
SourcePackage: pulseaudio
Uname: Linux 2.6.31-14-generic i686

Federico Pelloni (fredp) wrote :
Federico Pelloni (fredp) wrote :

I forgot, the problem disappears when I run Rhythmbox (even when paused) or even when I open the audio preferences and just let it sit there without doing anything.

Federico Pelloni (fredp) wrote :

I put on Youtube a video to show what happens: http://www.youtube.com/watch?v=2_W8HrRwep4
The subwoofer explains very well what I mean for cracks :D

hugochinchilla (hugochinchilla) wrote :

Im having similar noises, i think it happens when an app tries to connect with pulseaudio, once it's connected there aren't more cracks.


- when I scroll over the volume control makes a crack, but if I keep doing it doesn't
- when rythmbox starts
- when a youtube video starts
- every time empathy emits a sound

Federico Pelloni (fredp) wrote :

Once I had that symptoms too, but now the noises are coming out also when to desktop is idle, or doing nothing particular (like now, when writing this with Firefox without anything sound-related going on - neither Flash plugin).

Please fix this, it's very annoying.

Colin Ian King (colin-king) wrote :


Edit /etc/modprobe.d/alsa-base.conf as sudo, e.g. sudo gedit /etc/modprobe.d/alsa-base.conf and change the setting:

options snd-hda-intel power_save=10


options snd-hda-intel power_save=0

reboot and see if this solves the problem.

Changed in pulseaudio (Ubuntu):
importance: Undecided → Low
status: New → Incomplete
Federico Pelloni (fredp) wrote :

Great! So far problem seems fixed with that trick.
There's only one crack left at boot-time but I guess it happens when the soundcard is powered (and IIRC it happened also on previous releases).

Thank you very much.

EAB (adair-boder) wrote :

Thanks! That worked great!

Daniel T Chen (crimsun) on 2009-11-15
summary: - Cracking noise during boot and when idle
+ [9.10 regression] HDA power_save=10
affects: pulseaudio (Ubuntu) → linux (Ubuntu)
Changed in linux (Ubuntu):
status: Incomplete → Confirmed
tags: added: iso-testing
Brad Figg (brad-figg) on 2010-03-15
Changed in linux (Ubuntu):
status: Confirmed → Fix Released
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