[LAU] Phonic Helix Board 24 on Fedora

[hollunder at gmx.at]

On Sun, 15 Feb 2009 04:28:39 -0800
Mark Knecht <markknecht at gmail.com> wrote:

> On Sun, Feb 15, 2009 at 2:36 AM, Pieter Palmers <pieterp at joow.be>
> wrote:
> > Mark Knecht wrote:
> >>
> >> On Sat, Feb 14, 2009 at 8:14 AM, Pieter Palmers <pieterp at joow.be>
> >> wrote:
> >>>
> >>> Jonathan Gazeley wrote:
> >>>>
> >>>> Hi all,
> >>>>
> >>>> I'm trying to set up my Phonic Helix Board 24 on Fedora 10. I've
> >>>> added the CCRMA repository but I'm *not* running a CCMRA kernel.
> >>>> I have just used this repository to install ffado and jack.
> >>>>
> >>>> [jonathan at poseidon ~]$ uname -r
> >>>> 2.6.27.12-170.2.5.fc10.i686.PAE
> >>>>
> >>>> [jonathan at poseidon ~]$ rpm -q ffado
> >>>> ffado-2.0-0.6.rc1.fc10.ccrma.i386
> >>>>
> >>>> Starting jack gives the output below. Running as root gives
> >>>> exactly the same output. I've made sure that all users have
> >>>> read/write permissions on the firewire port (chmod a+rw /dev/fw*)
> >>>>
> >>>> I'm a fairly experienced Linux user but I know very little about
> >>>> audio on Linux. Can anyone shed any light on this? I had the
> >>>> same Phonic device working on Fedora 8 some time ago but that
> >>>> computer is now a distant memory...
> >>>>
> >>>> Any help will be gratefully accepted!
> >>>> Thanks,
> >>>> Jonathan
> >>>>
> >>>>
> >>>> [jonathan at poseidon ~]$ jackd -d firewire
> >>>
> >>> Run jackd in realtime mode.
> >>>
> >>> Pieter
> >>
> >> Is his kernel even a real-time kernel? I don't get that from the
> >> uname output...
> >
> > What I mean is:
> >
> > jackd -R -d firewire
> >
> > That doesn't require a RT kernel. Don't expect FFADO to work
> > properly when jack doesn't run in realtime mode (-R). The same
> > applies for ALSA or other backends btw, but FFADO is particularly
> > sensitive.
> >
> > Greets,
> >
> > Pieter
> >
> 
> Right, and OP should not expect zero xruns if he isn't using a
> real-time kernel.
> 
> There is a real rash lately of users trying to do real-time work
> without a real-time kernel. For some reason they put Jack support in
> MythTV and I've seen a couple of people there in the last few weeks
> that weren't even aware that there was a real-time kernel, much less
> actually using it, and they were complaining of xruns.
> 
> - Mark

For some reason there is jack support in all the major video players
and afaik it's done wrong in all of them (autoconnecting and
disconnecting on several occasions, which renders it pretty much
useless).

My guess is that they just want to have a nice feature list...

Philipp