RT_GROUP_SCHED kernel option makes JACK unusable in Ubuntu Natty

[David Henningsson]

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.

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic