subject:"\[Bug 433654\] Re\: \[Karmic\]\&\[Lucid\] Only one user has sound; no hw shows in Sound Preferences"

Mind you that I'd consider any device-kit privilege escalation
implementation that isn't configured to support/use (be itself easily
configurable by)  standard unix user group memberships as a regression.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Instead pulling users from the audio group etc. to make user switching
work, device-kit configuration needs to take user groups into account.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

** Also affects: consolekit (Ubuntu)
   Importance: Undecided
   Status: New

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

** Description changed:

+ Sound does not work for different users if they belong to the audio
+ group.
+
+ A workaround is to remove the users from the audio group. With this
+ however simply managing individual device access based on standard group
+ memberships stops working (regression).
+
+ Consolekit (like any kit handling device permissions/privilege
+ escalation) needs to enable audio only for users belonging to audio
+ group (when they are at the console), and leave it disabled for users
+ not in the audio group.
+
+
+
Steps to reproduce the bugs:
+
1. Create 2 new users, user1 and user2 (to be sure you use Karmic default
settings).
2. Restart. Login as one user, then double click on
/usr/share/example-content/Aesop'\''s_Fables,_Volume_1_(Fable_1)_-_The_Fox_and_The_Grapes.spx
3. Switch to second user. The sound from the first user is still playing
uninterrupted, even at gdm stage.
2. As the second user, double click on
/usr/share/example-content/Ubuntu_Free_Culture_Showcase/SpiritOfUbuntu.ogv
while the first user audio is still not finished.

Result: First user prevent any sound to be played as second user (with
Totem, the video even doesn't start, but with other applications you can
sometimes get the video but no audio). When the first user audio
finishes to play, audio can be played as user2, but that would block
audio for user1 if you switch back to its session.

Expected behavior: like in Jaunty and previous releases, sound from one
user should stop playing when another session is active. In Jaunty and
earlier, even VT had sound from one user when logged as this user, and
from the other when logged as him.

Some audio applications on one session also prevent any sound to be
played for the other user session even when they have nothing to play.

(Note: this is not a multi-seat setup, but a single seat computer with
multiple user accounts.
See attached screenshots for details).
-

Other example: a first user has a session open, playing sound with Amarok
(paused) on a Gnome desktop.
The second user chose Switch user in FUSA, then login. The new session
doesn't have any sound, and the Sound Preferences window only lists Dummy
Output - Stereo in the Output tab (Screenshot 1). In the hardware tab, nothing
appears (Screenshot 2).

When the first user closes Amarok, the second user now has the hardware
showing in the Hardware tab (Screenshot 3) but no sound, since the
Profile is Analog Stereo Duplex (should be Analog Stereo Output).
When the user changes it to the right Profile, sounds works (see also
Screenshot 4, compared to Screenshot 1 when no sound was played).

The second user can now play sound, for example a flash video.

Now though, the first user doesn't have any sound when coming back to
its session (or more exactly, the only sound he can hear is the flash
video being played in the second user's session, even though the users
have switched. Any audio application the first user opens shows in Sound
preferencesApplications, but doesn't output any sound, and moving the
application individual sound sliders only affect the sound being played
in session 2.

All that was handled properly in Jaunty and previous Ubuntu releases.

ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
- USERPID ACCESS COMMAND
- /dev/snd/controlC0: paphro 9493 F pulseaudio
+ USERPID ACCESS COMMAND
+ /dev/snd/controlC0: paphro 9493 F pulseaudio
Card0.Amixer.info:
- Card hw:0 'Intel'/'HDA Intel at 0xea30 irq 22'
-Mixer name : 'Realtek ALC889A'
-Components : 'HDA:10ec0885,1458a002,00100101'
-Controls : 38
-Simple ctrls : 21
+ Card hw:0 'Intel'/'HDA Intel at 0xea30 irq 22'
+ Mixer name : 'Realtek ALC889A'
+ Components : 'HDA:10ec0885,1458a002,00100101'
+ Controls : 38
+ Simple ctrls : 21
Date: Sun Sep 20 22:09:30 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: alsa-base 1.0.20+dfsg-1ubuntu4
PackageArchitecture: all
ProcEnviron:
- LANG=en_GB.UTF-8
- SHELL=/bin/bash
+ LANG=en_GB.UTF-8
+ SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-10.34-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-10-generic i686

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-07 Thread Chris Coulson

** Changed in: gnome-system-tools (Ubuntu)
   Importance: Undecided = Medium

** Changed in: gnome-system-tools (Ubuntu)
 Assignee: (unassigned) = Chris Coulson (chrisccoulson)

** Changed in: gnome-system-tools (Ubuntu)
   Status: Confirmed = In Progress

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-07 Thread Launchpad Bug Tracker

This bug was fixed in the package gnome-system-tools - 2.29.91-0ubuntu2

---
gnome-system-tools (2.29.91-0ubuntu2) lucid; urgency=low

  * debian/patches/26_user_profiles_conf.patch:
- Don't add users to the audio group. This is consistent with
  user-setup and fixes an issue with sound device permissions when
  switching between users. Thanks to Igor Wojnicki for spotting
  this (LP: #433654)
 -- Chris Coulson chris.coul...@canonical.com   Sun, 07 Mar 2010 11:56:59 
+

** Branch linked: lp:~ubuntu-desktop/gnome-system-tools/ubuntu

** Changed in: gnome-system-tools (Ubuntu)
   Status: In Progress = Fix Released

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-07 Thread Milan Bouchet-Valat

Chris: what about removing the 'audio' from from the system altogether?
ATM we still show it as a privilege in the Advanced dialog, which can be
misleading. Groups that aren't used shouldn't be created in the first
place, and users-admin will then hide them.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-07 Thread Daniel T Chen

Milan, that would be a very unwise thing to do for an LTS. Of particular
import is the fact that not every Ubuntu derivative uses PulseAudio.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-07 Thread Igor Wojnicki

Milan, I think that removing audio group is not a good idea. There are
at least 2 reasons.

1. It might affect a lot of system components at least udev, libmtp, alsa which 
might cause regressions.
2. It would prevent group based access control to the audio device - mind that 
/dev is dynamic, so configuring back /dev/dsp group owned by audio will not be 
that easy - i.e. this kind of access control is crucial if your box is used 
remotely as a juke box.

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Re: [Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-05 Thread AMSlider

Hi Igor,

Thanks so much for this!

U-DA-MAN!


Igor Wojnicki wrote:
 Guys I found it!!! Here is the solution!
 
 1st the lucid daily build (28.02.10) doesn't perform better than karmic, but 
 it gave me some clues.
 When it logged in (the daily build) as ubuntu I started rythmbox to play.
 I added another user aa.
 I switched to aa, and... the music stopped playing :) 
 then I started rhtythmox as aa, it plays nice.
 Swithed back to ubuntu and bummer, aa music keeps playing
 So I added another user bb and repeated the procedure but swichinch between 
 aa and bb. In either case whichever user starts the music first it gets 
 access to the audio device and it's not willing to give it beack upon 
 switching.
 Why than ubuntu user behaves differently, giving back access to the audio 
 device?
 I checked permissions: System-User Settings-Advanced-User Priviledges.
 It turns out that by default ubuntu DOES NOT have 'Use audio devices checked' 
 hmmm interesting.
 So I unchecked this option for both aa and bb users. Guess what It started 
 working!
 
 So I went back to karmic to investigate the user privileges there. ANd
 guess what, by default a desktop user has 'Use audio device' checked. So
 I unchecked it and... sound upon user switching started to work :)
 
 Bottom line. If you want to have a user, which currently uses the
 display, to have access to the sound device with all the benefits from
 sound muting upon user switch, you need to uncheck 'Use audio devices'
 privileges for this user. As a matter of fact I unchecked it for all my
 users.
 
 These privileges are very confusing then.
 I guess their proper interpretation is that if:
 - checked: the user locks the audio device as long as he wants, no sound 
 switching upon user switching,
 - unchecked: the user which currently uses the display has access to the 
 audio device, sound switching takes place upon user switching.
 
 Ant the last word. I think it is very sad what happens here. None of the
 developers/packagers could help the community with this problem. But the
 solution was there! It seems that this is a kind of undocumented feature
 nobody knows about. Isn't there something wrong with software/package
 care at ubuntu then?
 
 Anyway, have fun with your audio now!


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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Actually the problem is more general and it regards permissions to
access certain devices (and files in /dev directory).  Historically if a
user needs access to particular device he is assigned to a group which
group-owns the device file. It has worked for ages in the unix world
i.e. access to an audio device, cdrom, cd burner etc.

This group based approach has several well known limitations. Now it
seems that such an access is controlled by consolekit/policykit/udev,
which makes some sense, at least because of the dynamic nature of /dev
directory. The gnome-system-tools and especially users-admin seem not to
know anything about acl. I'm not sure whether it's good or bad - it
depends, espoecially that gnome is cross platform - on other systems
/dev might be static or there might be no acl at all. So I guess it
should be up to the ubuntu team to keep the group assignments and acl
sane and well documented, and the entire mechanism clear. Unfortunatelly
I haven't found any explanation of it :( in the documentation. Perhaps a
good idea it is to start a thread about it in the ubuntu formums.
However, in my opinion, such a big thing as device access policy should
be officially documented - not reverse engineered!

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Regarding the property 'Use audio device' and my motion (comment #48).

Giving it a second thought the rename might be unfortunate. Especially
if one does not have consolekit installed.

If consolekit IS NOT installed than assigning a user to audio group
makes an audio device accessible to him, which translates into 'Use
audio device' property which does that (by the way it seems that all
these properties translate into assigning the user to particular
groups).

If console kit IS installed, than upon log in/user switching, it
applies, through udev, acl to make /dev/{snd,audio,mixer) accessible by
the user which logs in/is switched to. Than, assiginig a user to audio
group doesn't make any sense and the name is misleading.

Bottomline. Since consolekit depends on ubuntu-dektop, which makes it
default and necessary package for ubuntu, the best solution would be not
to include a default desktop user in the audio group. It can be
performed by altering the gnome user profiles in /etc/gnome-system-
tools/users/profiles, see included attachment.

** Attachment added: profiles
   http://launchpadlibrarian.net/39965106/profiles

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-02 Thread Erik B. Andersen

** Changed in: gnome-system-tools (Ubuntu)
   Status: New = Confirmed

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-02 Thread Erik B. Andersen

What about the user that is made when installing? Isn't that an
administrator? I think we should make it so that the user that is
created when you install works properly too. (I'm just not sure if it is
based off the administrator profile. If it is, is it the right thing to
make the administrator not part of the sound group by default?)

I (somewhat) know how to package, so I could(would like to) try to make
a patch and debdiff for this, but before I do that, I want to make sure
that we agree on what is the correct changes to make. (It would also be
nice to have advice from someone who knows what implications this might
have, like the package maintainer.)

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Good point Erik. I'm not sure about that 'Administrator Profile' either
- that's why I didn't propose to change it. But It seems to be
reasonable to remove audio group from all three profiles.

I guess packaging is not a problem, committing the changes and making them to 
Lucid might be though. I already posted a question to gnome-system-tools 
maintainers: 
https://answers.launchpad.net/ubuntu/+source/gnome-system-tools/+question/103004
We'll see what they think about it.

Besides I posted the solution to the forum:
http://ubuntuforums.org/showthread.php?t=1420051

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Re: [Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-02 Thread Luke Yelavich

The user created during install is not created via the GNOME tools, but
via the low level command-line components to create users, so the first
user should not be in the audio group.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Luke you're right. Fortunately ubiquity (which is the ubuntu installer)
seems to work just fine - at least according to its changelog:

user-setup (1.27ubuntu1) karmic; urgency=low

  * Resynchronise with Debian. Remaining changes:
- Add the initial user to the adm, dip, lpadmin, and sambashare groups
  too, and to the admin group if no root password is set. Do not add
  them to the audio, video, floppy, dip, netdev, powerdev, or scanner
  groups.
...
 -- Colin Watson cjwat...@ubuntu.com  Wed, 24 Jun 2009 13:59:33 +0100

There are user default groups defined in d-i/source/user-setup/debian
/user-setup-udeb.templates (see ubiquity sources) which match the
changelog.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Guys I found it!!! Here is the solution!

1st the lucid daily build (28.02.10) doesn't perform better than karmic, but it 
gave me some clues.
When it logged in (the daily build) as ubuntu I started rythmbox to play.
I added another user aa.
I switched to aa, and... the music stopped playing :) 
then I started rhtythmox as aa, it plays nice.
Swithed back to ubuntu and bummer, aa music keeps playing
So I added another user bb and repeated the procedure but swichinch between aa 
and bb. In either case whichever user starts the music first it gets access to 
the audio device and it's not willing to give it beack upon switching.
Why than ubuntu user behaves differently, giving back access to the audio 
device?
I checked permissions: System-User Settings-Advanced-User Priviledges.
It turns out that by default ubuntu DOES NOT have 'Use audio devices checked' 
hmmm interesting.
So I unchecked this option for both aa and bb users. Guess what It started 
working!

So I went back to karmic to investigate the user privileges there. ANd
guess what, by default a desktop user has 'Use audio device' checked. So
I unchecked it and... sound upon user switching started to work :)

Bottom line. If you want to have a user, which currently uses the
display, to have access to the sound device with all the benefits from
sound muting upon user switch, you need to uncheck 'Use audio devices'
privileges for this user. As a matter of fact I unchecked it for all my
users.

These privileges are very confusing then.
I guess their proper interpretation is that if:
- checked: the user locks the audio device as long as he wants, no sound 
switching upon user switching,
- unchecked: the user which currently uses the display has access to the audio 
device, sound switching takes place upon user switching.

Ant the last word. I think it is very sad what happens here. None of the
developers/packagers could help the community with this problem. But the
solution was there! It seems that this is a kind of undocumented feature
nobody knows about. Isn't there something wrong with software/package
care at ubuntu then?

Anyway, have fun with your audio now!

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

PS. I would like to make a motion to:

1. rename the property 'Use audio device' to 'Use audio device exclusively',
2. make it unchecked by default,
3. document it.

It would apply to users-admin application in gnome-system-tools.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

** Also affects: gnome-system-tools (Ubuntu)
   Importance: Undecided
   Status: New

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

PS2. Disabling 'Use audio device' removes the user from audio group. And
since /dev/dsp is acl controlled, access to it is granted to the user
which currently uses the display. I guess that the ACL magic is done by
policykit/udev - but i'm not sure though.

So, to enable sound switching with user switching, just remove your
users from audio group.

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-01 Thread Luke Yelavich

As per latest comments, this is not a pulseaudio bug.

** Changed in: pulseaudio (Ubuntu)
   Status: Confirmed = Invalid

** Changed in: pulseaudio (Ubuntu)
   Status: Invalid = Confirmed

** Changed in: pulseaudio (Ubuntu)
 Assignee: Luke Yelavich (themuso) = (unassigned)

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-01 Thread Luke Yelavich

** Changed in: pulseaudio (Ubuntu)
   Status: Confirmed = Invalid

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

2010-03-01 Thread Erik B. Andersen

I couldn't seem to get the fix mentioned to work with existing users on
both karmic and lucid. It seems to work after a restart though. So I can
confirm that the fix works, after a restart.

I second Igor Wojnicki 's suggestion, with one additional thing:either upgrade 
the setting to unchecked if it is checked, or ask the user about it.
I had trouble with this bug for a long time before I tried to file a bug about 
this and found this bug. So, I imagine lots of people who don't usually file 
bugs wouldn't know about the fix, and the bug would still affect them after the 
default was updated, because their settings, which didn't change from the 
default, wouldn't be changed to the new default, right?

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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

** Summary changed:

- [Karmic] Only one user has sound; no hw shows in Sound Preferences
+ [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

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[Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences
https://bugs.launchpad.net/bugs/433654
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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Ok, I followed the instructions on the wiki. I disabled autospawning for
both users and then started pulseaudio as specified on both users. Then
on user 1 I started playing a .ogg. Opened sound preferences and and
verfied that the music player showed up. Switched to user 2. (Could
still hear user 1 sound. Login was silent) Opened sound preferences and
switched to the same out put device as user 1 (I have to sound output
devices: headphones and internal sound card). Tried to play another song
with totem. Totem opened, but wouldn't play. I could still hear user a
sound. After awhile user 1 's song finished and user 2 's song started,
and then eventually finished. Stopped both pulseaudio instances.

** Attachment added: pulseverbose_user2.log
   http://launchpadlibrarian.net/39894506/pulseverbose_user2.log

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[Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences
https://bugs.launchpad.net/bugs/433654
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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences


** Attachment added: Log from first user
   http://launchpadlibrarian.net/39894555/pulseverbose_user1.log

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[Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences
https://bugs.launchpad.net/bugs/433654
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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences

Ok, I think I figured out the difference between getting a dummy output  or 
having the output there but not working for the second user. 
If user 1 starts playing something before user 2 logs in an starts their 
client, then user 2 can't see (or select) the output in Sound Preferences 
(which usually would give them a dummy output if they have no other sound 
devices, right?). If both users have their pulseaudio going before one starts 
to play something, then user 2 can see the output device, but their sound 
applications can't play anthing.

I'll attach the logs.

** Attachment added: pulseverbose_user1_dummy.log
   http://launchpadlibrarian.net/39894859/pulseverbose_user1_dummy.log

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[Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences
https://bugs.launchpad.net/bugs/433654
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[Bug 433654] Re: [Karmic][Lucid] Only one user has sound; no hw shows in Sound Preferences