From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bent Bisballe Nyeng Subject: Re: Intel HD: ALC662 noise-bug on FitPC2i Date: Wed, 12 Dec 2012 15:45:46 +0100 Message-ID: <50C8989A.3030804@aasimon.org> References: <1355321775-2042-1-git-send-email-mengdong.lin@intel.com> <50C83190.7050001@aasimon.org> <50C880FC.20409@ladisch.de> <50C88351.3030401@aasimon.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from aasimon.org (unknown [78.143.82.13]) by alsa0.perex.cz (Postfix) with ESMTP id E702E264F23 for ; Wed, 12 Dec 2012 15:45:47 +0100 (CET) Received: from [192.168.0.10] (deva [192.168.0.10]) by aasimon.org (Postfix) with ESMTP id DA96FBC38 for ; Wed, 12 Dec 2012 15:45:46 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On 12/12/12 15:25, Takashi Iwai wrote: > At Wed, 12 Dec 2012 14:14:57 +0100, > Bent Bisballe Nyeng wrote: >> >> On 12/12/12 14:05, Clemens Ladisch wrote: >>> Bent Bisballe Nyeng wrote: >>>> When recording, audible clicking sounds are present in the resulting >>>> audio data. >>>> >>>> The corruption are composed of approximately 10 samples, and the >>>> nature of the corrupted values are such that they could come from an >>>> earlier buffer (the corrupted data resemble wav forms). >>> >>> This looks like a problem with your HDA controller; either the memory >>> bus is overloaded so that some writes are dropped, or the hardware is >>> just buggy. >>> >>> >>> Regards, >>> Clemens >> >> I tried to record some audio using windows 7 and here the noise was not >> present indicating that it is not buggy hardware. >> >> Also, the system was not under load when the arecord call was made so if >> the memory bus was overloaded I need another way to verify this. >> >> Are there any additional (useful) debugging info I can subtract from the >> system that will help aiding the debugging process? > > Which sound backend are you using at all? Does the problem appear if > you run with -Dhw for arecord? > > If it's using dsnoop or PulseAudio, the accuracy of DMA position > reporting plays a big role. In that case, changing position_fix > option cures often. > > Takashi There are no sound servers installed on the pc in question (it is a 'lean' pc) so arecord should be using the hardware directly already. I will try to run arecord with the -D parameter tomorrow. Kind regards Bent Bisballe Nyeng