Edgar,
On 2014-01-19 20:04, Edgar Aichinger wrote:
Am Sonntag, 19. Januar 2014, 14:08:26 schrieb Philip Rhoades:
This is what I have in Edit-Preferences-Audio/MIDI - seemingly no
matter
what I do:
Audio Backend
PortAudio
JACK
none
Output Device
Lots of ALSA devices
the third panel has:
MIDI Backend
ALSA
JACK
none
- can you tell me what you see in your setup?
The same. My build supports portaudio, but not portmidi, because of
the bug i referred to in my previous post. I tried to come up with a
quick solution yesterday, but failed, and won't have much time next
week to look at it again, sorry.
For me choosing either ALSA or JACK as MIDI Backend just works. For
JACK the jackd server has to be running of course...
Choosing the backend and pressing OK immediately creates the
respective denemo port, so it become visible in e.g. qjackctl in the
ALSA resp. MIDI tab (right panel), and I can connect my keyboard (left
panel) to it.
To use JACK MIDI properly you have to start the a2jmidid daemon or use
the -X seq commandline option (MIDI driver config option in qjackctl)
to jackd, both methods will forward ALSA MIDI ports to the JACK MIDI
system. JACK MIDI itself doesn't create hardware ports, so you need
that to see your MIDI keyboard in qjackctl's MIDI tab. a2jmidid is
preferred over -X seq because it supplies better MIDI timing.
OK, I have made some progress but a thorough analysis would require lots
of reboots of my server and I don't have time to do that at the moment -
sticking to ALSA for the time being:
- if I boot with the MIDI K/B plugged in - user "phil" can't get
ANYTHING going at all - no normal sound with mplayer, no MIDI
connections; root can get sound reliably and MIDI connections about half
the time; I think the order of the sound cards is being changed and also
there is a permission problem somewhere - I tried chmodding everything
in /dev/snd to 666 but it didn't help
- if I boot WITHOUT the MIDI K/B plugged in and plug it in after booting
- user phil and root can actually have normal sound plus MIDI connection
maybe about half of the time? - sometimes the existing Preferences setup
"just works" - like you said, but sometimes I have to reselect an item
and save it or select something else, save it and then change back to
what is listed above - sometimes I can't get it to work until another
reboot
- with limited testing, a cold boot seems to give better results than a
warm boot?
- sometimes, making some change or other will cause the loss of sound
and I will have to reboot just to get a working machine
At least now I know it can be made to work eventually, even if the
situation seems to be a bit hit and miss . .
Thanks to all!
Regards,
Phil.
--
Philip Rhoades
GPO Box 3411
Sydney NSW 2001
Australia
E-mail: [email protected]
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