linux-kernel - Re: [alsa-devel] 2.6.26.[6|7] vs. rt11 vs. alsa (usb) midi

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Date:	Wed, 29 Oct 2008 12:10:04 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [alsa-devel] 2.6.26.[6|7] vs. rt11 vs. alsa (usb) midi

At Tue, 28 Oct 2008 14:35:55 -0700,
Fernando Lopez-Lezcano wrote:
> 
> On Mon, 2008-10-27 at 09:13 +0100, Takashi Iwai wrote:
> > At Sat, 25 Oct 2008 19:46:27 -0700,
> > Fernando Lopez-Lezcano wrote:
> > > 
> > > Hi... anyone out there also having problem with this combination?
> > >    2.6.26.7 or 2.6.26.6 with 2.6.26.6-rt11 and alsa MIDI
> > > It looks to me like alsa midi is broken. 
> > > 
> > > Probably an interaction with the realtime kernel patch. A Fedora kernel
> > > based on 2.6.26.6 (2.6.26.6-49 on fc8) works fine, a very similarly
> > > patched kernel that includes the realtime patch does not. The
> > > configurations for both are almost the same (today I tried to change
> > > some of the most obvious differences and rebuild, with the same
> > > result). 
> > > 
> > > No problems with 2.6.24.7-rt21. 
> > > 
> > > Test: boot, login, plugin an external usb keyboard (Yamaha P250), it is
> > > recognized, use qjackctl alsa patchbay to connect it to kmidimon,
> > > kmidimon sees only _one_ midi message and that's it. Kmidimon can't be
> > > killed after that. 
> > 
> > What about other MIDI devices on other bus, e.g. an MPU401 on a PCI
> > soundcard or so?  There is a possibility of breakage in the USB driver
> > side, too.
> 
> I just tested an RME PCMCIA card + Multiface interface and it shows the
> same problem. No MIDI messages get through (but the LED in the Multiface
> blinks). Same hardware booted into 2.6.24.7-rt21 works fine. 

Then this should be in RT side.  There is no fundamental change
regarding rawmidi since some time ago...


Takashi
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