From owner-freebsd-current@FreeBSD.ORG Wed Sep 19 06:00:35 2012 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx2.freebsd.org (mx2.freebsd.org [IPv6:2001:4f8:fff6::35]) by hub.freebsd.org (Postfix) with ESMTP id 6A3D7106564A for ; Wed, 19 Sep 2012 06:00:35 +0000 (UTC) (envelope-from dougb@FreeBSD.org) Received: from [127.0.0.1] (hub.freebsd.org [IPv6:2001:4f8:fff6::36]) by mx2.freebsd.org (Postfix) with ESMTP id 480E714DBE6; Wed, 19 Sep 2012 06:00:35 +0000 (UTC) Message-ID: <50595F83.9030008@FreeBSD.org> Date: Tue, 18 Sep 2012 23:00:35 -0700 From: Doug Barton Organization: http://www.FreeBSD.org/ User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20120907 Thunderbird/15.0.1 MIME-Version: 1.0 To: matt References: <5059194F.4090002@FreeBSD.org> <50595E93.9080908@gmail.com> In-Reply-To: <50595E93.9080908@gmail.com> X-Enigmail-Version: 1.4.4 OpenPGP: id=1A1ABC84 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-current@FreeBSD.org Subject: Re: squealing/whistling audio X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Sep 2012 06:00:35 -0000 On 9/18/2012 10:56 PM, matt wrote: > On 09/18/12 18:01, Doug Barton wrote: >> Sometime in the last couple of months an old problem has resurfaced on >> HEAD, a sort of squealing/whistling sound in the audio, even without >> anything playing. The sound is similar to the wind whistling through >> something. >> >> Before I blindly go off on a bisecting spree, does anyone have a >> suggestion as to where I might look? >> >> Doug >> >> > Electrically that's usually oscillation (too high gain or too much > electrical feedback) or an unshielded input. Sorry, I should have been more clear. This problem doesn't occur in windows, or linux, and last time I checked, didn't occur in freebsd 8. I have everything irrlevant zeroed out in mixer. Doug -- I am only one, but I am one. I cannot do everything, but I can do something. And I will not let what I cannot do interfere with what I can do. -- Edward Everett Hale, (1822 - 1909)