udev, /dev/sound permissions problem

karr

With recent versions of udev(052, and 054) I have had a problem with sound not working when I first boot my computer, but if I run /etc/init.d/alsasound restart, sound starts working. I have alsa set to start at the boot runlevel. Today, I noticed something interesting about the permissions in /dev/sound when restarting alsa. Here is the output of "ls -l /dev/sound/*"

doode · n00b Joined: 09 May 2003 Posts: 13

I'm having the same problem.. Can't seem to figure it out.. Anyone else?

lbrtuk · l33t Joined: 08 May 2003 Posts: 910

.permissions files are being phased out. You need to specify them along with the rules.

dsd · Posted: Mon Feb 28, 2005 7:24 am Post subject:

every time you login, pam is setting permissions on your device nodes (setting you as the owner, specifying its own permissions, etc). this overrides whatever udev has just set.
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karr · Posted: Tue Mar 01, 2005 6:18 am Post subject:

I've made some progress on getting this to work. I removes /etc/security/console.perms, which leaves the permissions closer to correct.

Chewi · Posted: Wed Mar 02, 2005 2:08 am Post subject:

I've got this problem too but in /dev/snd, not /dev/sound. It only seems to happen to some of my device nodes though.

nonotme · Guru Joined: 29 Sep 2003 Posts: 356 Location: on.ca

just a fyi, but running udevstart is sufficient to enable the new rules.
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Epikuros · Posted: Sat Mar 12, 2005 8:24 pm Post subject:

I have the same "problem" (just a slight annoyance imho). My devices are slightly different before and after the restart. Send more info soon.
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Chewi · Posted: Sat Mar 12, 2005 11:12 pm Post subject:

Should have replied to this ages ago. My attempt at fixing it didn't work. Grr.

Morimando · Guru Joined: 14 Feb 2005 Posts: 339 Location: Germany

Maybe it's a problem with PAM? Did it give you some weird output lately?
I had some problems with PAM being weird when i changed my system to pure udev/Reiser4, so it's merely a guess, i'm running pam version 0.77-r8 and it works fine.
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Chewi · Posted: Sun Mar 13, 2005 12:06 am Post subject:

That's what I've got but there's a newer version. Gonna try that out.

karr · Posted: Wed Apr 06, 2005 7:22 pm Post subject:

I finally found the problem: coldplug. I removed it from the boot runlevel, and sound now works. Hope this helps you guys.

juniper · l33t Joined: 22 Oct 2004 Posts: 959 Location: we the north

zoltix · Posted: Wed Apr 13, 2005 4:03 pm Post subject:

I have the sampe problem ......

alligator421 · Apprentice Joined: 30 Jul 2003 Posts: 191

I had the same problem with udev and alsa.
Commenting all stuff in /etc/security/console.perms fixed the problem.

What I understand of the problem is that udev is setting all devices in /dev as root but when setting /etc/security/console.perms,
the console owner is trying make a link/node as a simple user in /dev but it can't because of the permissions. So the link below can't be made.
lrwxrwxrwx 1 root root 9 Apr 30 18:35 /dev/dsp -> sound/dsp

thepustule · Posted: Sun May 01, 2005 1:00 am Post subject:

Honestly!

Devfs is deprecated in the kernel. The newest Gentoo install handbook now instructs us to use udev. And this is how well it works?

And .permissions is "being phased out"? What's up with that? So the /dev filesystem we're supposed to be using still has major design decisions still in the process of being worked out? What's wrong with this picture?

Can anyone explain to me how this is supposed to be BETTER than devfs? At least devfs WORKED!

Chewi · Posted: Sun May 01, 2005 1:08 am Post subject:

I haven't been getting this problem in a long time and to be honest, I'd rather go through a few glitches in order to get udev than having to stick with devfs forever. It might have worked but it was a total mess. Let's not turn this into yet another udev vs devfs debate though.

thepustule · Posted: Sun May 01, 2005 1:24 am Post subject:

Fair enough...

My question wasn't so much about which is better udev or devfs, but more about the wisdom of switching gentoo when when udev seems to still be grossly unready.

Anyhow...

I noticed in /etc/security/console.perms that the line for sound is explicitly configured as 600 root.audio

What is the logic behind this? I mean, the very fact that we have a group called "audio" - wouldn't it make sense to make it 660? Or is this something I don't quite understand about what this file is doing?

Chewi · Posted: Sun May 01, 2005 1:41 am Post subject:

I don't really understand that either. A lot of the other things seem to say 660.

alligator421 · Apprentice Joined: 30 Jul 2003 Posts: 191

mmmh. My problem was not completely resolved after all.
Beside alsa, I had still problems with my usb printer as well.
udev was creating a node /dev/usb as a file, instead of a directory thus preventing /dev/usb/lp0 from popping up.

I browsed a while to find that current udev-045 is at fault and simply sucks.

tecknojunky · Posted: Tue May 03, 2005 8:23 am Post subject:

How do you get rid of this stupid audio group and simply let every user the ability to use the sound device?
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Chewi · Posted: Tue May 03, 2005 8:37 am Post subject:

I wouldn't recommend removing the audio device but you could adjust the permissions to allow "others" to use the device. 666 instead of 660 for example.

tecknojunky · Posted: Tue May 03, 2005 10:06 am Post subject:

What's strange is that my Esound daemon dies on start up. init.d will issue [OK] but when grepping th ps -ef output, esd is dead gone. After zapping and restarting it, apps can now use sound, but before I applied your permisson hack, it'd still not work.

WHat's wrong with my sound?
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Chewi · Posted: Tue May 03, 2005 11:28 am Post subject:

Esound is known for being very wobbly. I don't really use it. Try seeing if you can get any log output from it.

dirt · n00b Joined: 01 Apr 2005 Posts: 4

Listen to dsd... and take a look at /etc/security/console.perms file.

Thanks,