linux-kernel - Re: 3.6.0 regression, distorted sound failure while using jack and hd-audio

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Date:	Sun, 07 Oct 2012 23:27:43 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Helge Hafting <helge.hafting@...bb.no>
CC:	linux-kernel@...r.kernel.org,
	alsa-devel <alsa-devel@...a-project.org>
Subject: Re: 3.6.0 regression, distorted sound failure while using jack and
 hd-audio

(cc alsa-devel)

On 07.10.2012 21:34, Helge Hafting wrote:
> My sound setup works fine with 3.5.4, but have serious problems with 3.6.0
> 
> It is sound through jack that breaks, simply using "aplay" directly with the
> alsa device works.
> 
> When I use jack, my setup works fine with 3.5.4. But boot into 3.6.0,
> and I get badly distorted sound as if using an extremely overdone reverb effect. 
> And jack reports tons of xruns, several per second.
> 
> This can be worked around by going from 256 to 512 frames/period in the jack
> settings. But that also double the latency, which makes keyboard playing less
> pleasant.
> 
> It is not a case of 256 frames/period being (almost) too extreme for the machine. With kernel 3.5.4,
> I can use 128 frames/period and get mostly ok sound, with only an occational 
> xrun (and a correseponding pop in the sound). So I use 256 because that's solid.
> But with 3.6.0, not even 256 is enough. And it is not an occational pop, but
> awful distortion all the time.
> 
> I don't really know what has changed from 3.5.4 to 3.6.0. The hd-audio driver?
> Something in alsa? Or the scheduling?
> 
> Machine: Dell precision M6600 laptop, 8GB, 2.2GHz quad-core i7.
>          Usually at 800MHz to save power, this is enough for making sound.
> Kernels: 64-bit 3.5.4 or 3.6.0
> Distro: funtoo
> 
> Audio according to lspci:
> 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
> 
> Please tell if there is anything I should try. I can test other kernel versions
> or try patches.
> 
> Helge Hafting
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