Re: open /dev/snd/seq failed

[Matthias Koenig <list@phasorlab.de>]

Lee Revell <rlrevell@joe-job.com> writes:
> On Sun, 2006-06-11 at 19:30 +0100, John Rigg wrote:
>> On Sun, Jun 11, 2006 at 01:11:00PM -0400, Lee Revell wrote:
>> > Of course it won't work, snd-seq-midi is not loaded.
>> 
>> Thanks. Stupidity caused by lack of sleep.
>
> I can't see why udev does not load this module on demand when the
> sequencer is first used.

I don't think this can be done in this way you mention, because udev 
actually creates the device nodes. 
But of course a missing sequencer module has bothered me too.

One possibility would be to add some modprobe configuration
to load snd-seq-midi when your MIDI device driver gets loaded.
E.g. If you want to load snd-seq-midi automatically with loading 
of snd-foo, add this to some file in /etc/modprobe.d/:

install snd-foo /sbin/modprobe --ignore-install snd-foo && \
{ /sbin/modprobe\ --quiet snd-seq-midi ; }

If snd-foo gets loaded, it also loads snd-seq-midi. But somehow
I don't like this solution.

Another solution could trigger the loading of snd-seq-midi by
udev at Midi device detection time -- the time /dev/snd/midiC*
get created, we could start a script, which loads snd-seq-midi.
The udev rule could be something like:
KERNEL=="midiC*", RUN+="/path/to/alsa-seq-load"

Matthias