Re: [gentoo-user] Re: mdev: sound is only working some of the time.

[Alan Mackenzie <acm@muc.de>]

Hello, Walt.

On Tue, Mar 20, 2012 at 04:23:14PM -0700, walt wrote:
> On 03/20/2012 03:31 PM, Alan Mackenzie wrote:
> > Hi, all.

> > Got a problem with my system running under mdev.  When I try to play CDs
> > (with aqualung feeding into PulseAudio), no sound comes out.  However,
> > when I listen to an audio section from a newspaper page such as
> > www.tagesschau.de (no idea what audio format) it works.

> > Clearly this is something to do with mdev.  I had a look at the devices
> > in /dev, searching for those in group audio.  Under udev, I find the
> > following as device nodes:

> > adsp audio dsp mixer mixer1 sequencer sequencer2.

> > Under mdev, all of these bar one are symlinks into the real nodes in a
> > subdirectory.  The odd man out is mixer1 which is a device node, but
> > with owner/group begin root/root (rather than root/audio).

> > Can anybody suggest any fix, or further areas of exploration?  Thanks!

> Can you do chown root:audio on the mixer as a test?

Done so.  It didn't help.  It's mightily curious why that one device is
different from the others.  It's not so under udev.

Anyhow I found the problem.  It was pulseaudio.  I rebuilt it with its
udev use flag taken out.  This didn't help.

Then I rebuilt aqualung without the pulseaudio flag, and now things work.

As I type, I am listening to Mahler's second symphony, played by the
Bamberger Symphoniker conducted by Jonathan Nott.  I can recomment Mahler
for when things aren't going quite according to plan, and this recording
in particular.

-- 
Alan Mackenzie (Nuremberg, Germany).