The audio group

[ttoine at ttoine.net]

Le 24/08/2010 19:04, Scott Lavender a écrit :
>
>
> On Tue, Aug 24, 2010 at 8:56 AM, ttoine at ttoine.net 
> <mailto:ttoine at ttoine.net> <ttoine at ttoine.net 
> <mailto:ttoine at ttoine.net>> wrote:
>
>
>
>     Le 24/08/2010 12:11, Cory K. a écrit :
>>     On 08/24/2010 04:56 AM, David Henningsson wrote:
>>        
>>>     Hi,
>>>
>>>     Adding users to the audio group is not recommended for reasons I've just
>>>     documented here:https://wiki.ubuntu.com/Audio/TheAudioGroup
>>>
>>>     Looking at ubuntu studio documentation, you seem to recommend people to
>>>     add themselves to the audio group pretty much (found by doing a search
>>>     for "audio group" onhelp.ubuntu.com  <http://help.ubuntu.com>), so can we remove it? Change it to
>>>     something else?
>>>
>>>          
>>     That's under the "community" section. Something we don't control.
>>
>>     Also, it was nessesary in the past because of permissions needed for
>>     some soundcards. (firewire I believe) From what I have seen, our users
>>     are folks who have "single-user" systems. (this is actually our target
>>     audience and setup) So your "Implications" section will not apply to them.
>>
>>     Someone with more current grasp on the situation should chime in. As
>>     long as a solution can be found that works for everyone we can change
>>     the documentation. In the end, adding users still might be needed for
>>     corner cases and those folks won't care. They'll just want their gear to
>>     work. :)
>>
>>
>>     -Cory K.
>>
>>        
>     David, Cory,
>
>     Their would be one case, when a user would have his workstation in
>     a dedicated room for noisy hardware, and use a remote connection
>     with a low power computer in the studio, where this could be a
>     problem as David described.
>
>     With the current LTS release, the use of the "audio" group is for
>     a real time use of jackd. The document you may have found is this
>     one, I guess:
>     https://help.ubuntu.com/community/UbuntuStudioPreparation#Real
>     time (-rt) and Low latency (-lowlatency) kernels
>     <https://help.ubuntu.com/community/UbuntuStudioPreparation#Real%20time%20%28-rt%29%20and%20Low%20latency%20%28-lowlatency%29%20kernels>
>
>     For firewire sound cards, ffado driver needs user to be member of
>     the "video" group, as a firewire sound card is considered to be
>     similar as a "dv" camera by firewire libraries.
>
>     Maybe, we just have to change "audio" group for "realtime" or
>     something like that. That would mean changing the post
>     configuration of jackd installation package, wich create the
>     "audio" settings/entries for real time use. If you think this is
>     compulsory, then, it is easy to do it: ask the jackd maintainer to
>     change the group name, I and other update their documentation and
>     it's done.
>
>     To "fine tune", a dedicated possibility should be added to "User
>     and Group Manager Privileges" GUI, and maybe the "Use audio
>     devices" should be renamed for "Use audio devices on remote
>     connection" or something like that.
>
>     Toine
>
>
> Crimsun has mentioned that the user shouldn't be added to the audio 
> group at all for real-time privileges.  My understanding is that 
> privileges are granted by ConsoleKit for the active user at the 
> keyboard.  Unfortunately, that is the extent of my understanding.
>
> You can see his explanation beginning at [20:09] here: 
> http://irclogs.ubuntu.com/2010/05/16/%23ubuntustudio-devel.txt
>
> I haven't tested this though and I don't think the user has been 
> removed by default from the audio group for maverick at this point.
>
> ScottL
>

ScottL,

Jack from Ubuntu 10.04 repositories won't start in real time if the user 
is not in the audio group. For that, you have to use the jackd 2 from 
the PPA of falk-tj, on Launchpad.

Are you using his backports as a base for maverick ?

Toine
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://lists.ubuntu.com/archives/ubuntu-studio-devel/attachments/20100825/e0fbcb10/attachment-0001.htm