Jaunty beta + RT + Jackd + Ardour, it works ;-D

[ttoine at ttoine.net]

Cory K. a écrit :
> laurent.bellegarde wrote:
>   
>> Hi again,
>>
>> i've done a new reboot, compared hardy's limits.conf to jaunty'one, and so
>>
>> hardy'one working :
>>
>>
>> @audio          -       rtprio          99
>>
>> @audio - memlock 999844
>>
>> jaunty'one working but if i launch with sudo
>>
>> @audio - memlock 770240
>> @audio - rtprio 99
>> @audio - nice -10
>>
>> so I check ubuntustudio controls, everything is ok, the limits.conf is 
>> like the controls in GUI.
>>
>> then i have a look to laurent un user, and see that in groups, there was 
>> no audio group. I add one, and tick laurent and root as members of this 
>> group, i've done a new reboot, and now i can launch qjackctl + ardour on 
>> RT without any xruns at 2,9ms latency !!!
>>
>> what is surprising is that in hardy, i check audio group presence, 
>> there's none !!! but qjackctl is available as none root ???
>> But now, I understand why in hardy, changing the size of allowed memory 
>> change nothing face to the ardour message which was telling me there was 
>> a limit in my system...that's normal, because laurent is not in an audio 
>> group, so limits.conf can't work...
>>
>> So I can't explain why in same condition hardy settings are working and 
>> why jaunty not, but after adding an audio group, and tick your account 
>> user in it, a reboot, it works perfectly...
>>
>> RT kernel is ok for stable release the 23 of april...
>>     
>
> Ok. Thanx for the info. Maybe something can be done before Jaunty
> releases. Luke can say definitively.
>
>
> -Cory K.
>
>
>   
Since Intrepid, there's no "audio" group created by default. It is the
same for Jaunty. Perhaps it could be a tweak to add the configuration
script of Ubuntu Studio.

Toine