[alsa-devel] 2.6.26.[6|7] vs. rt11 vs. alsa (usb) midi
nando at ccrma.Stanford.EDU
Tue Oct 28 22:35:55 CET 2008
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?
> > 22.214.171.124 or 126.96.36.199 with 188.8.131.52-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 184.108.40.206 (220.127.116.11-49 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 18.104.22.168-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 22.214.171.124-rt21 works fine.
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