The audio group
ttoine at ttoine.net
ttoine at ttoine.net
Wed Aug 25 19:19:21 BST 2010
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:
>>> 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:
> time (-rt) and Low latency (-lowlatency) kernels
> 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.
> 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:
> 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.
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 ?
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