midi port does not work

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Hi!

I am trying to hook up a MIDI keyboard. Here is my configuration:

Asus P4P800-E motherboard with on-board sound and MIDI/game port.
MIDI port is configured 0x330 irq 5 in BIOS setup

Fedora 7 with kernel 2.6.22.7-85.fc7 (tried with the previous 2.6.22.5-76.fc7 also)
alsa-lib-1.0.14-3.fc7
alsa-utils-1.0.14-1.fc7

I also downloaded and built alsa-driver-1.0.15rc3, alsa-lib-1.0.15rc3 and alsa-utils-1.0.15rc1

$ lsmod | grep mpu401
snd_mpu401             13096  1
snd_mpu401_uart        12544  1 snd_mpu401
snd_rawmidi            28160  2 snd_seq_midi,snd_mpu401_uart
snd                    61348  17 snd_seq_midi,snd_intel8x0,snd_ac97_codec,snd_seq_dummy,snd_seq_oss,snd_seq_midi_event,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_mpu401,snd_mpu401_uart,snd_rawmidi,snd_timer,snd_seq_device

$ aseqdump -l
 Port    Client name                      Port name
  0:0    System                           Timer
  0:1    System                           Announce
 14:0    Midi Through                     Midi Through Port-0
 20:0    MPU-401 UART                     MPU-401 UART MIDI

$ aseqdump -p 20:0
Cannot connect from port 20:0 - Input/output error

# tail /var/log/messages
Sep 28 08:08:05 localhost kernel: ALSA /home/sandy/alsa-driver-1.0.15rc3/drivers/mpu401/../../alsa-kernel/drivers/mpu401/mpu401_uart.c:263: cmd: 0x3f failed at 0x330 (status = 0x80, data = "">
Any ideas? I could probably dig into the code a bit, if you give me some hints where to look and what to look for.
Thanks.

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