From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0002006]: High frequency noise in output from SI7012 (intel8x0) Date: Thu, 6 Apr 2006 04:27:31 +0200 Message-ID: <49e96ca1d33cd811a52b21ef7976facd@bugtrack.alsa-project.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [85.132.177.35]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id E2440177 for ; Thu, 6 Apr 2006 04:27:31 +0200 (MEST) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org The following issue has been SUBMITTED. ====================================================================== ====================================================================== Reported By: jaime Assigned To: ====================================================================== Project: ALSA - driver Issue ID: 2006 Category: PCI - intel8x0 Reproducibility: always Severity: major Priority: normal Status: new Distribution: Slax 5.1.0, Debian Etch, Ubuntu Dapper Kernel Version: 2.6.16 / 2.6.15 ====================================================================== Date Submitted: 04-06-2006 04:27 CEST Last Modified: 04-06-2006 04:27 CEST ====================================================================== Summary: High frequency noise in output from SI7012 (intel8x0) Description: Sound chip is SI7012 built into Asrock K7S8X. To demonstrate the noise, I've played "orig.wav" throught the SI7012 and recorded the (analog) output on another computer. When I boot the PC into Windows 2000, the output is clean: the recording is "win2k.wav". Then I reboot into Linux and use "aplay -Dhw:0,0 orig.wav" and record the output again: the recording is "alsa.wav". Ignoring the clicks in the last half of "win2k.wav" (the click are the hard-drive reads), I can hear a high frequency intermittent "buzz" in the last half of "alsa.wav" that isn't present in "win2k.wav". To hear this, I think you will need headphones, but the buzzing is definitely there. As the three wave files are too big to attach, I've put them on the web here: orig.wav: http://www.carbon.eclipse.co.uk/orig.wav win2k.wav: http://www.carbon.eclipse.co.uk/win2k.wav alsa.wav: http://www.carbon.eclipse.co.uk/alsa.wav The version used is 1.0.11rc2, but the same problem occurs in the older 1.0.10. ====================================================================== Issue History Date Modified Username Field Change ====================================================================== 04-06-06 04:27 jaime New Issue 04-06-06 04:27 jaime Distribution => Slax 5.1.0, Debian Etch, Ubuntu Dapper 04-06-06 04:27 jaime Kernel Version => 2.6.16 / 2.6.15 ====================================================================== ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642