RT_GROUP_SCHED kernel option makes JACK unusable in Ubuntu Natty

[Ronan Jouchet]

On 10-12-14 04:31 AM, David Henningsson wrote:
> On 2010-12-14 05:34, Ronan Jouchet wrote:
>> Hi Ubuntustudio-devel, Ubuntu-kernel, JACK-devel, Alessio,
>>
>> After talking with adi in #ffado and las in #jack, it appears that
>> Natty's kernel needs adjustment to be usable for audio work. Currently
>> the kernel flavors shipped by Ubuntu have the RT_GROUP_SCHED option
>> activated, which makes JACK unusable (las put up
>> http://jackaudio.org/linux_group_sched to sum up the situation).
>>
>> *Until this problem is solved, JACK is unusable under Natty*.
>
> So is rtkit, see http://pastebin.ubuntu.com/543481/
>
> This affects pulseaudio, but I wouldn't say it's unusable, just more
> likely to have crackling audio on some machines.


Hi David,

Well it causes JACK to refuse to start ("Operation not permitted", see 
http://pastebin.com/xzvZxfkV ), so I maintain the term "unusable".

Good day,

Ronan