linux-kernel - Re: 4.0-rc3: sound broken in chromium but not in mpg123

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Date:	Sun, 15 Mar 2015 09:23:15 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Pavel Machek <pavel@....cz>
Cc:	perex@...ex.cz, alsa-devel@...a-project.org,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 4.0-rc3: sound broken in chromium but not in mpg123

At Sun, 15 Mar 2015 09:15:44 +0100,
Pavel Machek wrote:
> 
> On Sun 2015-03-15 09:12:47, Takashi Iwai wrote:
> > At Sat, 14 Mar 2015 21:11:09 +0100,
> > Pavel Machek wrote:
> > > 
> > > Hi!
> > > 
> > > Intel desktop machine:
> > > 
> > > 00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High
> > > Definition Audio Controller (rev 01)
> > > 
> > > Sound worked ok in both in previous kernel versions.
> > > 
> > > Any ideas?
> > 
> > How broken?  Did you get any error messages?
> 
> I get some funny, faint, rhytmic noises where audio should
> be... Actually, I somehow suspect something is wrong with time during
> video playback.

Did you try audio playback without video on chromium?

> > If the behavior depends on the application (e.g. ALSA vs OSS), I'd
> > suspect rather a device permission problem at first.  There are no
> > significant changes between 3.19 and 4.0-rc3 regarding HD-audio.
> 
> My system contains pulseaudio, so it is more complex than ALSA vs OSS
> :-(.

OK, that was missing information :)
Then there should be any difference in the kernel driver side -- it's
only a single PA process who accesses the sound device in the very
same manner no matter what clients are used (after all it's the
purpose of PA).

> Audio seems to work ok on thinkpad x60 with very very similar config.

OK, then another thing I would check is to try different sample rates
(e.g. via playing WAV files over PA).


Takashi
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