[alsa-devel] Can't connect to MIDI output of Edirol UA-1000

Colin Fletcher colin.m.fletcher at googlemail.com
Thu Nov 15 14:15:50 CET 2012

On 18/09/12 16:14, Colin Fletcher wrote:
> On 18/09/12 15:47, Colin Fletcher wrote:
>> On 18/09/12 15:23, Clemens Ladisch wrote:
>>> Colin Fletcher wrote:
>>>> I've just recently noticed that connections to the MIDI output
>>>> of my Edirol UA-1000 fail when using the snd_ua101 driver in
>>>> recent kernels.
>>>> aconnect simply reports "Connection failed (Input/output
>>>> error)"; a2jmidid -e says "ERROR: a2j_port_create:
>>>> snd_seq_connect_to() for 20:0 failed with error -5"
>>> Are there any error messages in the system log?
>> Hi Clemens,
>> Not a squeak in/var/log/syslog or /var/log/messages when I try to
>> connect using aconnect, no. Can you think of anywhere else I might
>> look?
>> Colin.
> Just a little more info: 'strace aconnect 20:0 20:0' shows that the
> SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT ioctl on "/dev/snd/seq" is the thing
> which is giving the EIO error.

Hello Clemens,

I wondered whether what you said about a problem with the US-122 MIDI 
out [1] was the same problem as mine. with the UA-1000, so I tried 
kernels and 2.6.39.

With kernel, aconnect can connect to the MIDI out of my 
UA-1000; with 2.6.39, it fails, so it seems likely that it is the same bug.

Would a bisection between these kernels be useful, or do you have an 
idea already of what might have caused this regression?

Colin Fletcher.

[1] http://www.spinics.net/linux/fedora/alsa-user/msg11499.html

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