From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ricard Wanderlof Subject: Re: bug Date: Tue, 31 Mar 2015 10:24:06 +0200 Message-ID: References: <1427551386.3092172.246393281.691C33A7@webmail.messagingengine.com> <5518F8F3.10304@ladisch.de> <1427711234.231499.246955417.6E2E7C65@webmail.messagingengine.com> <55192FBC.1070307@ladisch.de> <1427726222.1872206.247049189.3E3BB0F7@webmail.messagingengine.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Return-path: Received: from bes.se.axis.com (bes.se.axis.com [195.60.68.10]) by alsa0.perex.cz (Postfix) with ESMTP id EEBB22612AC for ; Tue, 31 Mar 2015 10:24:08 +0200 (CEST) In-Reply-To: <1427726222.1872206.247049189.3E3BB0F7@webmail.messagingengine.com> 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: "Nikita N." Cc: "alsa-devel@alsa-project.org" , Clemens Ladisch List-Id: alsa-devel@alsa-project.org On Mon, 30 Mar 2015, Nikita N. wrote: > We are the devs involved in dCore porting, and that is one of our users > report: > http://forum.tinycorelinux.net/index.php/topic,18225 > = > We verified that in few of our legacy laptops. > It didn't reproduce for every laptop, but indeed in a couple of them, > the temperature of the speakers reached extremes levels in few seconds, > only unplugging the AC/DC cable saved them. > This is a serious problem in our opinion, and we would hate to see our > dCore reputation spoiled. > We hate to admit, but it is *NOT* our bug, and would hate to see this > bug reverse engineered into a virus/malware (on Linux, or other OS) and > see ourselves blamed for it. > So we would like to keep the incident quiet, and we are going to remove > that thread from our forum. > On the other side, we would expect any action from ALSA project in > removing that tool and/or exposing the real individual/s guilty of > writing that tool. First of all, I can't say I'm representing the ALSA project or anyone else = in this matter, so the following is just my personal opinion. Furthermore = I have no real experience with the mixer application under discussion = (alsamixergui), but on the face of it it just looks like any mixer = application. >>From the thread linked above, it seems that if someone maxes out all = controls in the mixer, this results in a high-pitched whine in the = speakers, which on certain laptops seem to cause the destruction of = something in the machine (likely the speakers themselves). It is further = speculated in the thread that what might be happening is acoustic feedback = from the speakers to the microphone, which would make sense given the = results, but would seem strange from a system design point of view. First of all, it would seem that this wouldn't be dependent on a = particular mixer application such as alsamixergui, but should be able to = happen with any mixer application, given the appropriate settings. Secondly, if you believe that alsamixergui specifically is missbehaving, = why don't you just take it out of your distribution (dCore)? Thirdly, and perhaps most importantly, this seems to be a hardware = problem. If the drive capability of the laptops's output stage is too much = for the speakers, then there is a serious design flaw in the hardware. = Given the proliferation of cheap PC hardware this is not surprising, but = it is hardly a software problem. And finally, as Clemens said, alsamixergui is not created by the ALSA = project, so this mailing list is the wrong place to look if none other = than for that particular reason. /Ricard -- = Ricard Wolf Wanderl=F6f ricardw(at)axis.com Axis Communications AB, Lund, Sweden www.axis.com Phone +46 46 272 2016 Fax +46 46 13 61 30