Can't connect to MIDI output of Edirol UA-1000

Can't connect to MIDI output of Edirol UA-1000

[Colin Fletcher]

Hello all,

I hope this is the right place to report this and ask for help: if
not, I'd be glad of a pointers to any more appropriate forum.

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.

Although the port is listed, connections to it fail from all the
software I've tried: qjackctl, a2jmidid and aconnect all fail to connect.

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"; and qjackctl reports no error but refuses
to make the connection.

I've observed the problem in stable kernels 3.0.39 and 3.4.11; it
works as expected when booted into a 2.6.32 kernel, where the
snd_usb_audio driver is used for the UA-1000. Other USB MIDI devices
appear to work fine with the newer kernels.

Incidentally, I also noticed that the 'Control' MIDI in & out of the
UA-1000 no longer appear when using snd_ua101, but I don't think this
is related, since changing the values of midi_ep.out_cables and
midi_ep.in_cables to 3 in the ua101_probe() function in
sound/usb/misc/ua101.c brings the control in & out back, but I'm still
unable to connect the outputs.

Any help, suggestions, patches or requests for more details gratefully
received!

Thank you,

Colin Fletcher.

Re: Can't connect to MIDI output of Edirol UA-1000

[Clemens Ladisch]

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?


Regards,
Clemens

Re: Can't connect to MIDI output of Edirol UA-1000

[Colin Fletcher]

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.

Re: Can't connect to MIDI output of Edirol UA-1000

[Colin Fletcher]

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.

Colin.

Re: Can't connect to MIDI output of Edirol UA-1000

[Jannis Achstetter]

Colin Fletcher <colin.m.fletcher <at> googlemail.com> writes:

> 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"; and qjackctl reports no error but refuses
> to make the connection.

I just want to note that the problem is exactly the same with the Edirol UA-101
(uses the same driver) and linux-3.5.3

Re: Can't connect to MIDI output of Edirol UA-1000

[Colin Fletcher]

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 2.6.38.8 and 2.6.39.

With kernel 2.6.38.8, 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

Re: Can't connect to MIDI output of Edirol UA-1000

[Clemens Ladisch]

Colin Fletcher wrote:
> With kernel 2.6.38.8, 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.

It's the same bug, caused by this patch: http://git.kernel.org/linus/88a8516a2128

Fix coming soon.


Regards,
Clemens

Re: Can't connect to MIDI output of Edirol UA-1000

[Colin Fletcher]

On 15/11/12 14:14, Clemens Ladisch wrote:
> Colin Fletcher wrote:
>> With kernel 2.6.38.8, 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.
>
> It's the same bug, caused by this patch: http://git.kernel.org/linus/88a8516a2128
>
> Fix coming soon.

It's great to hear you know the cause of this. Thank you very much!

Armed with that information, I've found that replacing '#ifdef 
CONFIG_PM' with '#if 0' and commenting out calls to 
usb_autopm_{get|put}_interface() inside sound/usb/ gets me a working 
MIDI out on kernel 3.4.18 for now, which makes me happy.

If there's a proper patch I can usefully test, I'd be very glad to know 
about it.

Thank you.

Colin.