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

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Date:	Mon, 16 Mar 2015 13:37:19 +0100
From:	Pavel Machek <pavel@....cz>
To:	Takashi Iwai <tiwai@...e.de>
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

On Sun 2015-03-15 09:23:15, Takashi Iwai wrote:
> 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?

Yes. Does not work, either; I tried
http://www.thenakedscientists.com/HTML/podcasts/ .

> > > 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).

Like this?

pavel@amd:/usr/share$ pacat ./sounds/alsa/Front_Right.wav
pavel@amd:/usr/share$ pacat --rate=48000 ./sounds/alsa/Front_Right.wav
pavel@amd:/usr/share$ pacat --rate=44100 ./sounds/alsa/Front_Right.wav
pavel@amd:/usr/share$ pacat --rate=32000 ./sounds/alsa/Front_Right.wav
pavel@amd:/usr/share$ pacat --rate=16000 ./sounds/alsa/Front_Right.wav
pavel@amd:/usr/share$ pacat --rate=8000 ./sounds/alsa/Front_Right.wav

This seems to have behaved as expected.

Thanks,
									Pavel

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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