Re: Discussion [MIDI USB X-Files Episode]
Re: Discussion [MIDI USB X-Files Episode]
- Subject: Re: Discussion [MIDI USB X-Files Episode]
- From: Michel <email@hidden>
- Date: Fri, 20 Sep 2002 22:24:14 +0100
On Friday 20 September 2002 21:43, Andy wrote:
>
Do we actually need/want a discussion or am I being paranoid ?
>
>
It does appear that something may be awry somewhere in the bowels of
>
the MIDI server. Or that driver writers, (like me) are not quite
>
aware of the whole story.
Indeed, with that setup:
+ 1 Roland sc8820 (3 in/outs, with a roland driver, but that probably acts as
a nub)
+ 1 EZBus (3 in/outs)
+ 2 Evolution keyboards (1 in/out each)
That and the usual set of hubs, mouse etc on USB.
Note that all of those devices (save the roland, but that driver has been
tested for >1 year) are 'compliant': they don't use a third party driver.
Regularly one or the other peripheral vanishes from CoreMIDI awareness. Note
that I do quite a lot of launch/quits of MIDI apps, so the server does a lot
of restarts.
When a device diseapears:
+ Power cycling the device doesn't fix the problem.
+ Unplugging/replugging the device doesn't fix the problem
+ Quitting all MIDI apps to kill the MIDI server doesn't fix the problem.
Sometime, you can recover it by one of those 3 methods, but most of the time
you need to reboot.
Also, when the machine is in that 'forgetful' state, it has become quite
common that the machine will panic at some point, preferably when I wake it
up the next day.
It is hard to analyse what is the cause of that. For example, the EZbus is
also a USB 'soundcard' (2 * 24/48Khz); if MIDIserver 'forgets' EZbus exists,
the USB sound still works fine. It means it's not the device that is crashed
somehow.
Another interesting point is that one of the Evolution keyboard (MK-225C) has
a led display that blinks in a certain way if it is reset via USB. And
regularly I see that keyboard getting reset for no apparent reason, usualy
while playing it.
Given the 'smoky' feel of those issues, it's hard to file a bug report. If
you have any strange experience with your device, please contribute them so
we can nail that one down!
Michel
--
Linux yawn 2.4.19-ac4 #49 Tue Aug 6 10:13:51 BST 2002 i686
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| | >Discussion (From: Andy <email@hidden>) |