[alsa-devel] Cranking sound coming out of speakers with the new 3.1 kernel
tiwai at suse.de
Tue Feb 28 16:38:12 CET 2012
At Tue, 28 Feb 2012 16:16:48 +0100,
Jan Prunk wrote:
> Hello !
> On Sat, Jan 14, 2012 at 12:04 AM, Jonathan Nieder <jrnieder at gmail.com> wrote:
> > Hi again,
> > Jan Prunk wrote:
> >> I tried booting into 3.2.0-rc7-686-pae, but the crunching sound
> >> is still present, I am able to play music file properly, and
> >> crunching is in the background, and also while not processing
> >> any sounds, the crunching appears out of the speakers.
> > Ok, thanks for testing. Please send a summary of this regression to
> > alsa-devel at alsa-project.org, cc-ing Takashi Iwai <tiwai at suse.de> and
> > either me or this bug log so we can track it.
> > Be sure to mention:
> > - steps to reproduce, what you expect versus what actually happens,
> > and how that indicates a bug
> The sound is ok in kernel version "3.0.0-1-686-pae" but on all newer
> versions there are sparkling/farting noises coming out of the speaker.
> The noise is not very loud, its barely noticeable, but its repetative
> and doesn't go away. And I think it happens while typing on the
> keyboard and a bit later, then it dissapears for a few seconds,
> or by the time that I type again.
> > - which kernel versions you tried, and what happens with each
> I tried running alsa-info.sh as a "user".
> I tried 3.0.0-1-686-pae here is the debug:
> Linux vaio 3.2.0-1-686-pae #1 SMP Fri Feb 17 06:27:21 UTC 2012 i686 GNU/Linux
> ii linux-image-3.2.0-1-686-pae 3.2.6-1
> Linux vaio 3.2.0-rc7-686-pae #1 SMP Wed Dec 28 21:26:25 UTC 2011 i686 GNU/Linux
> ii linux-image-3.2.0-rc7-686-pae 3.2~rc7-1~experimental.1
> Being booted into this version for 15 minutes, it seems to not make any noises,
> but I will resubmit the info later if the noises will start to appear.
3.2.0-rc7 alsa-info shows that the headphone jack is plugged, thus the
speaker is muted. It's natural that the noise goes away in this
Apart from that, I see no obvious problem in 3.2.0 output.
Does the problem still happen when you disable "Auto-Mute Mode" mixer
% amixer -c0 set "Auto-Mute Mode" "Disabled"
Also, try to pass algin_buffer_size=0 option to snd-hda-intel.
I don't expect much that this will influence, but at least, it's a
difference between 3.0 and 3.2.
> > - alsa-info.sh output, as an attachment
> > - if you can make a recording of the strange sound available
> > somewhere online, that would be ideal
> Because the noise is barely heard, I would need to find a good mic.
> to be able to record it, but I could do that in the next bug submission.
> > - whether you are able to bisect or test patches if needed
> I might try that, if there are any manuals around how to do it,
> but my response might take some time.
> >  may have more hints.
> > Thanks and good luck,
> > Jonathan
> >  http://alsa-project.org/main/index.php/Help_To_Debug_Intel_HDA
> Kind regards,
> Jan Prunk
> Jan Prunk http://www.prunk.si
> 0x00E80E86 http://pgp.prunk.si
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