[pulseaudio-discuss] ACLs for USB devices on Debian GNU/Linux Squeeze/testing
Frode Severin Hatlevik
frodeseverin at gmail.com
Thu Aug 19 09:47:48 PDT 2010
2010/8/8 Frode Severin Hatlevik <frodeseverin at gmail.com>:
> First of all, I will like to say thank you for a great piece of
> software. PulseAudio makes sound a mor pleasant experinence.
> Now to my problem. It is not with PA itself, but rather a matter of
> setting up my system to make things work. I have several USB devices;
> all from Logitech, incidently; that I want to use with my laptop. I am
> using Debian GNU/Linux Squeeze/testing on an i686 kernel.
> Before using PA I had my users in the "audio" group. After using PA
> for a while I removed all users from the "audio" group, and this
> solved all issues with user switching. I will try to reflect this in
> the Debian Wiki after successfully sorting out my present issue. The
> Debian wiki page for sound seems rather dated; it does not mention PA
> at all.
> After purging users from the "audio" group I am no longer able to use
> my USB sound devices; nether my headset nor the mic on my webcam works
> anymore, they simlly disappeared form the PA subsystem. The devices
> worked befor the purge. I have been advised that this is due to the
> lack of ACLs for the device nodes in /dev/snd, but I am at a loss in
> how to set this up in Debian. I understand that configuring the
> devicenodes is a task for the hotplug system together with udev and
> ConsoleKit, but I have little experience with setting theese up.
I have now figured this one out for myself. It turned out to be quite
simple. I only needed to add a file, say 60-sound.rules containing the
Then I issued "udevadm trigger" and things started working.
It is important to note that this rule should be numbered below 70, as
the standard udev rule dealing with ACL is
at least on my Debian Squeeze/testing. Thus the matching needs to be
done prior to the execution of this rule.
I will file this as a bug in Debian BTS. Should this udev-trick be
included in the guide for packaging PA?
Da sa Gud: "Det bli lys!"
Og det ble lys.
1. Mosebok 1.3
And God said, "Let there be light,"
and there was light.
Genesis 1:3, NIV
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