OK, here are the results:

* Tested with kernel version 3.15.0-031500-lowlatency, specifically the
mainline kernel file linux-
image-3.15.0-031500-lowlatency_3.15.0-031500.201406111300_amd64.deb and
the associated header file.

* Bug persists in the tested kernel version = front panel MIDI uart is
unable to receive

* Downloaded kernel source linux-source-3.15.0

* Patched file emump401.c (see attached file), built kernel, installed
kernel (this one has the build number linux-
image-3.15.0-rc8_3.15.0-rc8-2_amd64)

* Cold-started computer (cold start is necessary to force the MINI
microcontroller into its power-up state without the reset pulse)

* Bug fixed, front panel MIDI works.


** Attachment added: "emumpu401.c"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1328746/+attachment/4129882/+files/emumpu401.c

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https://bugs.launchpad.net/bugs/1328746

Title:
  Soundblaster Audigy front panel MIDI fails to initialize

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