** Changed in: ubuntustudio
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/159257
Title:
midi out not working on both hardware and timidity
Status in Ubuntu Studio Project:
Invalid
Bug description:
System Config
========
Motherboard: nForce 405 with MCP61 onboard soundcard, Dual core AMD64 X2.
Midi Interface: Edirol UM-1 USB
Ubuntu: Ubuntu Studio Gutsy 7.10, amd64 architecture, with realtime kernel
(default installed)
Problem: System cannot play midi file using aplaymidi & audacious -
both to external MIDI keyboard & to internal timidity port.
To be exact:
=======
1. aplaymidi -p 20:0 xxx.mid (where port 20:0 represents Edirol, connected
to a keyboard) - stopped with no sound, until terminated with Ctrl-C
2. aplaymidi -p 128:0 xxx.mid (whre port 128:0 represents timidity port) -
stopped with no sound, until terminated with Ctrl-C
3. Running AconnectGUI while aplaymidi is playing shows aplaymidi without any
port in the display.
4. Same problem when audacious midi-plugin is configured to use ALSA
back-end. If set to the alsa back-end (to either Edirol or timidity), trying to
play midi file doesn't produce any sound, and hangs audacious until Ctrl-C.
Audacious set to use fluidsynth back-end works beautifully, so it's not
audacious or midi-plugin problem.
5. MIDI input is not a problem.
6. Running Jack and QSynth doesn't help --- though the port is visible,
trying to use aplaymidi -p xxx (where xxx is the port of QSynth) produce
exactly the same problem.
7. The only application that can successfully output MIDI to either Edirol,
Timidity, or QSynth is Rosegarden.
8. With the same hardware, problem does not exist in earlier Ubuntu Studio
Feisty 7.04 32-bit, and other Linuxes 32-bit (Puppy Linux) or 64-bit (64Studio
amd64 works fine).
9. running timidity directly from command line (timidity -in xxx.mid)
of course works, but this bypass alsa and therefore is irrelevant.
Only change made to the system:
1. chrt is used to raise the audio-interrupt-priority to -91 (from default of
-51 or something)
2. cpu power management changed to "performance" from originally "ondemand"
3. /etc/security/limits.conf --- "@audio nice -10" is added.
The above 3 changes is necessary to eliminate xruns (without them,
xruns figure goes up to hundreds).
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