[alsa-devel] Loud pops from Intel HDA onboard sound, may damage speakers (fwd)
kailang at realtek.com
Fri Mar 25 09:05:48 CET 2011
Attachment was the patch that refference by snapshot 2011.03.25.
Fixed & Update List:
- Fixed ALC66x pop noise on suspend and resume.
This patch that I test on Acer NB. The result is better than before.
Could you know how to pull EAPD to low on power down state?
----- Original Message -----
From: Takashi Iwai
Cc: Chris Wilson ; Wu Fengguang ; Pshou ; andy.kopp at intel.com ;
dan.d.kogan at intel.com ; alsa-devel at alsa-project.org
Sent: Friday, March 25, 2011 3:52 PM
Subject: Re: Loud pops from Intel HDA onboard sound, may damage speakers
At Fri, 25 Mar 2011 15:43:55 +0800,
> > ALC269 has some workarounds using COEF magic. Maybe there is a
> > similar trick for ALC663. Kailang, do you know of it?
> ALC663 has no this control bits like ALC269.
> But it can use EAPD to control it.
> The EAPD pull low before suspend.
> When the resume back, run the EAPD to pull high first.
> I could send the patch for you later.
I vaguely remember that this was tried for other codecs but didn't
give good results (rather worse). Anyway let's check again.
> ----- Original Message -----
> From: Takashi Iwai
> To: Chris Wilson
> Cc: Wu Fengguang ; Pshou ; Kailang ; andy.kopp at intel.com ;
> dan.d.kogan at intel.com ; alsa-devel at alsa-project.org
> Sent: Friday, March 25, 2011 3:00 PM
> Subject: Re: Loud pops from Intel HDA onboard sound, may damage speakers
> At Thu, 24 Mar 2011 22:41:47 +0000 (GMT),
> Chris Wilson wrote:
> > Hi Takashi and all,
> > On Thu, 24 Mar 2011, Takashi Iwai wrote:
> > >>> Does this happen with 2.6.38 kernel, too?
> > >>
> > >> I have not tried yet, do you have reason to think it may have changed
> > >> since 2.6.32?
> > >
> > > Lots of changes since 2.6.32. I won't be surprised if any of them
> > > hits.
> > >
> > >> Can I build just the sound driver without replacing the whole kernel?
> > >
> > > You can try alsa-driver tarball.
> > Unfortunately, I can confirm that stock 2.6.38 does NOT resolve the pops
> > on suspend and resume.
> OK, then did you try to set option power_save_controller=0 for
> ALC269 has some workarounds using COEF magic. Maybe there is a
> similar trick for ALC663. Kailang, do you know of it?
> ------Please consider the environment before printing this e-mail.
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