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

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Date:	Sun, 7 Oct 2012 21:34:52 +0200
From:	Helge Hafting <helge.hafting@...bb.no>
To:	linux-kernel@...r.kernel.org
Subject: 3.6.0 regression, distorted sound failure while using jack and
 hd-audio

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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