Re: [LAU] no connection...

On Thu, 2008-11-27 at 17:43 -0500, Preston C. wrote:
> On Thu, Nov 27, 2008 at 8:01 AM, Crypto <crypto@email-addr-hidden> wrote:
> > Am Friday 21 November 2008 23:30:00 schrieb Preston C.:
> >> > Thank you Crypto. I will try what you said about using kmidimon and
> >> > then get back with you. Thanks again. I hope I didn't send this to
> >> > your private email. It seems that when I hit reply in Gmail it sends
> >> > it to people's private address?
> >>
> >> I tried Kmidimon and got no signal. I attached a screenshot of my
> >> desktop and setup.
> >
> >
> > Preston,
> >
> > I have to admit I am having some trouble here myself which I could not yet
> > solve reliably, that is why I respond so late...
> >
> > It might have to do with the sound device that is selected in kmix (I wrote
> > about that issue some other day a while ago).
> >
> > There are several variables/applications involved that want examination so I
> > guess it will take me some time until I can give further details on that.
> >
> > The problem that I have is that like You I cannot receive MIDI data from an
> > external USB device, but in this case kmon showed me that sometimes there is
> > a short number of MIDI messages I get and then it all stops and I do not see
> > any more messages, and sometimes I get no MIDI messages at all.
> >
> > As I said a while ago I wrote about this problem and noticed that it could
> > have to do with the sound device to which kmix is set to. When You run kmix
> > (open it from the task bar) and You have several sound devices for sound
> > output then kmix offers a popup menu from which to choose which one You want
> > to adjust. I have noticed that I get these hangups when the internal onboard
> > sound of my notebook is selected here, and it is all just fine when the USB
> > sound device is selected, but now I am not so sure here anymore.
> >
> > I also had some problems to get qjackctl running properly when there are
> > several sound devices available. It seemed the problem could be fixed when
> > setting qjackctl to output do "default" device and input from "default"
> > device and apart from that set the sound device with the single menu at the
> > top menu called "interface". But still I have problems with that and get no
> > MIDI data, so I have to have a closer look at what is happening here.
> >
> > BTW, do You have no MIDI data even when not running a RT kernel? It could also
> > be a kernel related problem, as I had no problems with an older RT kernel.
> >
> > Possible solutions for me:
> > Run jackd via command line (only), so I can see exactly what jackd gets when
> > run.
>
> Crypto, you are right! I tried it with a non-RT kernel and everything
> worked... except for the major popping sounds. Is there anyway for me
> to update my RT kernel, I use CCRMA, and then try it? Thanks a lot.

If you need to use 2.6.26.x there is no fix available (AFAIK). MIDI i/o
from external devices in the alsa sequencer is broken. I got a partial
solution that gets midi input going but the internal timer in the alsa
sequencer is broken anyway.

What to do depends on which Fedora you are running, if < 9 then you
could use the older 2.6.24.x rt kernel, if on 9 or 10 there is nothing
you can do until some kernel guru steps in and fixes the problem
(2.6.24.x is too old for the X server that runs on Fedora 9 - if you try
you will get X segfaults every once in a while and your session will
just die).

I have had good enough results running the stock Fedora kernel on Fedora
9. Make sure that jackd is running with realtime priority...

Sorry to not have better news.
-- Fernando

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Received on Fri Nov 28 04:15:04 2008