Bug#664068: USB MIDI keyboard fails to initialize

[Olivier MATZ <zer0@droids-corp.org>]

Hi Jonathan,

>> I tested your patches on a 3.3.6 kernel and they work fine.
>
> Weird --- those patches don't do anything for 0763:019b.  Could you
> attach "lsusb -v" and "alsa-info.sh --no-upload" output[1]?

Indeed this is weird. I first tested it with a 3.4.0 kernel that without
the patch and it was not working. Then I rebooted on a patched 3.3.6
kernel and the midi keyboard was working. Of course, in both case, I
took care to revert /etc/laptop-mode/conf.d/usb-autosuspend.conf

But I agree with you that this is very surprising when we look at
patch as it does not match my vendor/device ID. Maybe it was just
luck, as the issue described initially by David seems to occur for
90% of tests. Or perhaps I was too fast and I hit a key before the
keyboard switched in powersave mode ?

Unfortunately I won't be able to do the test again before weeks as the
keyboard is currently not at my home (that's also why I took time to
answer and I was not able to test it more deeply). As soon as I can do
the test again, I will post requested info (lsusb and alsa-info).

Regards,
Olivier