From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: [Alsa-user] Master volume control Date: Thu, 14 Mar 2013 21:08:47 +0100 Message-ID: <51422E4F.5090803@ladisch.de> References: <512F0AF5.3050502@googlemail.com> <5141E854.206@ladisch.de> <1D8C99720146460FA33752A5FE614436@PAULD> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com [66.111.4.25]) by alsa0.perex.cz (Postfix) with ESMTP id 0DDE42615E6 for ; Thu, 14 Mar 2013 21:10:04 +0100 (CET) In-Reply-To: <1D8C99720146460FA33752A5FE614436@PAULD> 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: "Paul D. DeRocco" Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Paul D. DeRocco wrote: >> I'd guess that some driver uses a busy loop for writing the codec >> registers. >> >> Which drivers are you using for your sound hardware? > > It's Intel HD Audio. That driver works fine. > But the point is that three other processes light up when I move the slider. > I think they're all monitoring the master volume changes, and not actually > involved in doing the volume change. I guess your CPU doesn't have too many cores ... > What I'm wondering about these processes (pulseaudio, threaded-ml, > indicator-sound) PulseAudio has its own virtual volume sliders on top of the hardware controls. indicator-sound appears to be an OSD of your desktop environment. I don't know what threaded-ml is (maybe part of Chrome?). > I would expect lots of CPU usage if I had alsamixer open at the time, > because it monitors these changes, and updates its display. Well, how much increas in CPU usage do you get wth alsamixer? > * If I create my own minimal embedded distro (I'm trying to use the Yocto > project for that), will they simply not be there If you don't included the relevant packages. Regards, Clemens