From mboxrd@z Thu Jan 1 00:00:00 1970 From: Randy Cushman Subject: Inexplicable mixer control creation Date: Tue, 13 Mar 2007 20:21:08 -0400 Message-ID: <45F73FF4.1000902@earthlink.net> References: <45F1830D.9020609@earthlink.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mta9.adelphia.net (mta9.adelphia.net [68.168.78.199]) by alsa0.perex.cz (Postfix) with ESMTP id 69B19243DA for ; Wed, 14 Mar 2007 01:21:27 +0100 (CET) Received: from [127.0.0.1] (really [67.20.25.133]) by mta9.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20070314002125.BAVA2196.mta9.adelphia.net@[127.0.0.1]> for ; Tue, 13 Mar 2007 20:21:25 -0400 In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org In attempting to implement my proposed mixer control name changes (see "[Alsa-devel] RFC: Enhance AD AC '97 mixer control names") I have encountered behavior that makes no sense to me: If module snd_ac97_codec does not create a control with the name 'PCM Playback Volume' then something else creates a control with that name. Not surprisingly, this phantom control serves no useful purpose in my environment, as it has no affect on AC '97 control registers. Configuration details: Using Fedora Core 5 kernel 2.6.18-1.2239.fc5 (i686) with the latest ALSA-driver source from Mercurial. Details: - I have ruled out the possibility that module snd_ac97_codec or snd_intel8x0 could be creating the control, because the following steps cause the control to disappear: # modprobe -r snd_intel8x0 # modprobe -r snd_ac97_codec # modprobe snd_ac97_codec # modprobe snd_intel8x0 - I have also ruled out (using calls to printk) the possibility of the control being created via calls to snd_ac97_cnew(), snd_ac97_cmute_new_stereo() or snd_ac97_cvol_new(). - The phantom control appears after booting to runlevel 3 or 5. - If removed using the above modprobe commands, the phantom control will appear after logging into a KDE session. - If removed using the above modprobe commands, the phantom control does not appear after logging into a Gnome session. Any suggestions for how I might track down the source of this phantom control would be welcome. Randy Cushman ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV