[LAU] jackd process can't be killed

[Fernando Lopez-Lezcano]

On Wed, 2008-12-31 at 19:13 -0800, Ken Restivo wrote:
> On Wed, Dec 31, 2008 at 12:49:26AM -0800, Fernando Lopez-Lezcano wrote:
> > On Tue, 2008-12-30 at 21:44 -0800, Ken Restivo wrote:
> > > On Tue, Dec 30, 2008 at 04:20:11PM -0500, R Dicaire wrote:
> > > > On Tue, Dec 30, 2008 at 3:42 PM, Adam Sampson <ats at offog.org> wrote:
> > > > 
> > > > > This looks like the 2.6.26 MIDI sequencer problem -- MIDI doesn't work,
> > > > > and after jackd has opened the sequencer device for the first time,
> > > > > it'll hang trying to close it. Future attempts to open the sequencer
> > > > > device then fail because it's in use.
> > > > 
> > > > Ahhhhhhhh, I was never aware there was a midi issue...jackd could be
> > > > killed when I didn't use -X, excellent.
> > > > Thank you VERY much.
> > > > 
> > > > Now here's another situation. I've built alsa and jack. I installed
> > > > them into custom locations. In my users .asoundrc
> > > > I have a pcm device that calls the jack plugin. How would I get calls
> > > > to this plugin to use my custom built
> > > > /usr/local/alsa/lib/alsa-lib/libasound_module_pcm_jack.so instead of
> > > > the system one in /usr/lib/alsa-lib ?
> > >
> > > MIDI doesn't work in 2.6.26???!
> > > 
> > > Is that for real? Is it really a kernel problem or an ALSA problem? 
> > > Is there a workaround?
> > 
> > The problem I see is with the rt patch applied. And only when
> > interfacing with external hardware midi interfaces. A partial workaround
> > made midi input work, but the internal timer has problems. 
> > 
> > I have not checked midi under 2.6.26-rt12 yet...
> 
> I have a 2.6.26.8-rt12 sitting here built, ready to try booting off of it.
> 
> What exactly is the MIDI problem, and how could I duplicate it here? I'd 
> be happy to test with this kernel (on a x86 Atom) and see if it is solved.

The problem I see only happens when you use the ALSA sequencer API with
any external MIDI interface. The sequencer API works fine as long as
external ports are not involved. And if you use an external MIDI
interface through the rawmidi interface it works fine. The combination
of rawmidi + sequencer fails...

-- Fernando