From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Henningsson Subject: Re: [PATCH] ALSA: HDA: Use LPIB position fix for Macbook Pro 7, 1 Date: Fri, 13 Jan 2012 09:55:56 +0100 Message-ID: <4F0FF19C.10304@canonical.com> References: <1326382274-4103-1-git-send-email-david.henningsson@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by alsa0.perex.cz (Postfix) with ESMTP id 725932446E for ; Fri, 13 Jan 2012 09:55:59 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Takashi Iwai Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On 2012-01-13 09:50, Takashi Iwai wrote: > At Thu, 12 Jan 2012 16:31:14 +0100, > David Henningsson wrote: >> >> Several users have reported "choppy" audio under the 3.2 kernel, >> and that changing position_fix to 1 has resolved their problem. >> The chip is an nVidia Corporation MCP89 High Definition Audio, >> [10de:0d94] (rev a2). >> >> Cc: stable@kernel.org (v3.2+) >> BugLink: https://bugs.launchpad.net/bugs/909419 >> Signed-off-by: David Henningsson > > Applied now. Thanks. Thanks. Just a thought...this was reported as working better under the previous Ubuntu release, which run kernel 3.0 (and not too many changes in PulseAudio), i e, a regression. While I haven't done any serious kernel bisection of this, I know you've being doing some work with the snoop/non-snoop stuff lately, which I haven't followed closely. Do you think this can be related to why we're seeing broken position values when we're using the DMA position buffer map on some machines? -- David Henningsson http://launchpad.net/~diwic