[alsa-devel] Cranking sound coming out of speakers with the new 3.1 kernel

[Takashi Iwai]

At Thu, 1 Mar 2012 08:44:33 +0100,
Jan Prunk wrote:
> 
> Hello !
> 
> The sound has been stable for the last days without noises,
> after applying % amixer -c0 set "Auto-Mute Mode" "Disabled"

OK, another question is whether the auto-mute feature works in hardware,
i.e. even when this mixer is set off, the hardware switches the
speaker upon plugging the headphone?  If yes, we can simply remove
this switch and software feature from the driver.


thanks,

Takashi

> 
> It seems this has solved it, until further notice.
> You might want to keep the bug open for a while,
> so I can check with all the kernels (it works with latest).
> 
> Kind regards,
> Jan
> 
> On Tue, Feb 28, 2012 at 4:38 PM, Takashi Iwai <tiwai at suse.de> wrote:
> > 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:
> >> http://www.alsa-project.org/db/?f=c1149b6466b2068d79c7517a8b0808d8b5c26e6b
> >> ---
> >> 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
> >> http://www.alsa-project.org/db/?f=fddbfbdc4fc44555a6dc851ecdc70760da6dd840
> >> ---
> >> 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
> >> http://www.alsa-project.org/db/?f=78c8919e87dd03294484f83b5f7ae44331b5edfe
> >> 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
> > state.
> >
> > 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
> > enum?
> >        % 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.
> >
> >
> > Takashi
> >
> >
> >> >  - 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.
> >>
> >> > [1] may have more hints.
> >> >
> >> > Thanks and good luck,
> >> > Jonathan
> >> >
> >> > [1] 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
> >> http://AS50763.peeringdb.com
> >>
> 
> 
> 
> -- 
> Jan Prunk   http://www.prunk.si
> 0x00E80E86  http://pgp.prunk.si
> http://AS50763.peeringdb.com
>