Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753233AbbFKWXX (ORCPT ); Thu, 11 Jun 2015 18:23:23 -0400 Received: from mail-wg0-f67.google.com ([74.125.82.67]:33561 "EHLO mail-wg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752453AbbFKWXV (ORCPT ); Thu, 11 Jun 2015 18:23:21 -0400 Date: Fri, 12 Jun 2015 01:23:18 +0300 From: Mihai =?UTF-8?B?RG9uyJt1?= To: Takashi Iwai Cc: Jonathan McDowell , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: Re: Audio crackles with 4.1-rc1 Message-ID: <20150612012318.6e3482ed@mdontu-l> In-Reply-To: References: <20150429112859.GY10148@earth.li> <20150430150131.GA10148@earth.li> <20150502150513.GF10148@earth.li> <20150519161911.GD28070@earth.li> <20150519215310.GF28070@earth.li> <20150610131755.0b906783@mdontu-l.dsd.bitdefender.biz> <20150610134135.327e2bdc@mdontu-l.dsd.bitdefender.biz> <20150610144551.4578ee99@mdontu-l.dsd.bitdefender.biz> <20150610192202.0e987fd0@mdontu-l.dsd.bitdefender.biz> <20150610194303.3b82609d@mdontu-l.dsd.bitdefender.biz> <20150611011236.53bcd1fd@mdontu-l> Organization: Home MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="MP_/T.dxYCzhkdDvq/yaTk8/SDI" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 18983 Lines: 287 --MP_/T.dxYCzhkdDvq/yaTk8/SDI Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Thu, 11 Jun 2015 07:01:13 +0200 Takashi Iwai wrote: > At Thu, 11 Jun 2015 01:12:36 +0300, Mihai Don=C8=9Bu wrote: > > On Wed, 10 Jun 2015 20:23:01 +0200 Takashi Iwai wrote: > > > From: Takashi Iwai > > > Subject: [PATCH] ALSA: hda - Reduce click noise at power up > > >=20 > > > Some machines suffer from click noises at power up with the recent > > > kernels, and this seems triggered at the power transition and the > > > immediate verb executions. As a workaround, put a short delay (10ms) > > > right after the D0 transition. > > >=20 > > > There are a few places that have the same kind of delays, especially > > > in the resume path. I guess they can be removed (or reduced) after > > > this patch. But, since the delay is relatively small, let's do it > > > later as a cleanup. > > >=20 > > > Reported-by: Mihai Don=C8=9Bu > > > Signed-off-by: Takashi Iwai > > > --- > > > sound/pci/hda/hda_codec.c | 3 +++ > > > 1 file changed, 3 insertions(+) > > >=20 > > > diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c > > > index b7782212dd64..38f5509ee52f 100644 > > > --- a/sound/pci/hda/hda_codec.c > > > +++ b/sound/pci/hda/hda_codec.c > > > @@ -3077,6 +3077,9 @@ static unsigned int hda_set_power_state(struct = hda_codec *codec, > > > break; > > > } > > > =20 > > > + if (power_state =3D=3D AC_PWRST_D0) > > > + msleep(10); > > > + > > > return state; > > > } > > > =20 > >=20 > > I take back my previous observations. I was at work and did not have > > access to headphones (one of those days). Now I'm at home, it's 1 AM, > > very quiet, and I notice the following: > >=20 > > * on speakers: the click reproduces but with _very_ low amplitude; > > msleep(100) is unnoticeable, but msleep(10) is, barely; > > * on headphones: the moment I plug them I hear a loud static sound > > (like an old, untuned AM radio). If I play something, the static > > disappears. If I pause, the static returns after ~15s. >=20 > OK, then the patch is no-go. We need a bit deeper analysis. >=20 > About the headphone problem: don't you get the same issue with 4.0.x? > Please take alsa-info.sh outputs on both 4.0.x and 4.1 before and > after plugging the headphone, and attach the outputs. > (Run the script with --no-upload option.) No, 4.0.5 and all previous kernels (>=3D 3.12) are OK. I have attached a small tarball with the two files produced by alsa-info.sh. 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