Le 24/08/2010 19:04, Scott Lavender a écrit :
On Tue, Aug 24, 2010 at 8:56 AM, tto...@ttoine.net
<mailto:tto...@ttoine.net> <tto...@ttoine.net
<mailto:tto...@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
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