From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Henningsson Subject: Re: Speaker burnout Date: Tue, 07 Apr 2015 12:55:59 +0200 Message-ID: <5523B7BF.8060504@canonical.com> 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> <551A6A15.1070605@canonical.com> <1427796392.581386.247465613.43178C71@webmail.messagingengine.com> <551A7A4D.203@canonical.com> <55236B93.9070504@blennerhassett.gen.nz> <5523828C.8060301@canonical.com> <5523868A.3020502@ladisch.de> <55238C11.5000404@blennerhassett.gen.nz> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" 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 B99872604BD for ; Tue, 7 Apr 2015 12:55:55 +0200 (CEST) In-Reply-To: <55238C11.5000404@blennerhassett.gen.nz> 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: Eliot Blennerhassett , Clemens Ladisch Cc: Takashi Iwai , alsa-devel@alsa-project.org, "Nikita N." List-Id: alsa-devel@alsa-project.org On 2015-04-07 09:49, Eliot Blennerhassett wrote: > On 07/04/15 19:26, Clemens Ladisch wrote: > >> In theory, it would be possible to do the mixing in the analog domain. >> But there is no way to find out what the HDA codec actually does except >> trying it out. > > > Dear testers, please perform the following steps: > > 1. Place laptop on heat-resistant surface in a well-ventilated space. > Have a fire extinguisher handy. Put on your earmuffs. > 2. Start stopwatch > 3. Set all alsa volumes to maximum > 3.1 If screaming noise not already evident, play this full-scale square wave > 4.1 If smoke or flames appear from your laptop, stop stopwatch. > Extinguish any flames. > 4.2 If 30 seconds elapsed without smoke, terminate the test. > 5. Report back to us the results, if necessary borrow a friend's > computer to do so. > > Hmmm, why isn't anyone volunteering to do this testing? > > Seriously, How is the safe limit going to be determined? I think Alexander had a good idea: http://mailman.alsa-project.org/pipermail/alsa-devel/2015-March/089815.html ...now if this is chromebook, and I'm not sure whether that's the case or not, maybe "Windows" should be replaced with "Chrome OS", but anyhow - check what the supported OS is doing, and I believe Alexander suggested a safe way to do so. Nikita - here's your chance to show that you're actually interested in getting the bug fixed, and not only to discuss whether alsamixer is a screwdriver or a microwave. On the physical hardware that has this problem, please perform the tests as Alexander suggested. And also run the alsa-info script on that hardware, and submit the result here. -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic