linux-kernel - Re: [REGRESSION bisected] Sound goes too fast due to commit 7b3a177b0

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Date:	Wed, 14 Apr 2010 16:36:36 +0200
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Jaroslav Kysela <perex@...ex.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org, Frank Griffin <ftg@...drunner.com>
Subject: Re: [REGRESSION bisected] Sound goes too fast due to commit 7b3a177b0

On 14/04/10 15:39, Takashi Iwai wrote:
:
> 
> bdl_pos_adj is really a workaround for devices that report wrong DMA
> position (or at the wrong timing).  I guess position_fix=1 may fix
> better.
> 
> Although the driver already has a dynamic switching of position_fix
> method, it checks only the very first read.  If it gives a (more or
> less) sane value, it prefers the position-buffer method (corresponding
> to position_fix=2) rather than reading LPIB register
> (position_fix=1).
> 
> It seems, however, that more devices work sanely with LPIB reg
> nowdays.  This wasn't the case formerly.  So, it might be better to
> use position_fix=1 as default for modern systems...
Frank,
Could you check that for you too adding "position_fix=1" fixes the problem?

To do so, edit /etc/modprobe.conf and add this line at end:
options snd-hda-intel position_fix=1

You need to reboot for this to be taken into account.

Cheers,
Eric
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