Mark Haidekker, thank you for reporting this and helping make Ubuntu better.
Could you please test the latest upstream kernel available from the first line
at the top page (not the daily folder) following
https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional
upstream developers to examine the issue. Once you've tested the upstream
kernel, please comment on which kernel version specifically you tested. If this
bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER
where VERSION-NUMBER is the version number of the kernel you tested. For
example:
kernel-fixed-upstream-3.15
This can be done by clicking on the yellow circle with a black pencil icon next
to the word Tags located at the bottom of the bug description. As well, please
remove the tag:
needs-upstream-testing
If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER
As well, please remove the tag:
needs-upstream-testing
Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.
** Description changed:
This bug has been around for a while. I have seen it in the forums circa
2007, and I have provided a solution in 2009. Since the modified code
never found its way into the mainstream kernels, I am issuing the fix as
a bug report.
The bug concerns the Soundblaster Audigy cards with the emu10k1 chip in
both i386 and amd64 architectures, in any kernel (standard, RT etc).
They have on-board joystick MIDI. There is an optional front-panel
module, which provides its own MIDI UART. Under Linux, the front MIDI
does not work. People with dual-boot systems have reported that booting
Windows first, then rebooting into Linux makes the UART function
properly.
The cause for the bug lies in the fact that the front panel MIDI is
routed through a microcontroller (resides in the front panel module),
and this microcontroller needs a defined reset signal once after power-
up. Up to this point, the GPIO _levels_ are initialized correctly, but
the reset _pulse_ is never issued. Essentially, the emu10k1 chip's GPIO2
needs to be pulled high for a brief interval.
- The bug can be fixed in the file linux-
- source-3.13.0/sound/pci/emu10k1/emumpu401.c in the function
- snd_emu10k1_audigy_midi(). The proposed patch follows right after the
- present initialization of the second UART (note the added variable "val"
- to store the GPIO bits):
-
+ WORKAROUND: The bug can be fixed in the file
linux-source-3.13.0/sound/pci/emu10k1/emumpu401.c in the function
snd_emu10k1_audigy_midi(). The proposed patch follows right after the present
initialization of the second UART (note the added variable "val" to store the
GPIO bits):
int snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu)
{
struct snd_emu10k1_midi *midi;
int err;
unsigned int val; /* Needed in GPOUT2 pulse initialization */
midi = &emu->midi;
if ((err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)")) < 0)
return err;
midi->tx_enable = INTE_MIDITXENABLE;
midi->rx_enable = INTE_MIDIRXENABLE;
midi->port = A_MUDATA1;
midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
midi->interrupt = snd_emu10k1_midi_interrupt;
midi = &emu->midi2;
if ((err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2")) < 0)
return err;
midi->tx_enable = INTE_A_MIDITXENABLE2;
midi->rx_enable = INTE_A_MIDIRXENABLE2;
midi->port = A_MUDATA2;
midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2;
midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2;
midi->interrupt = snd_emu10k1_midi_interrupt2;
/*** NEW CODE *** Pulse reset line for the second UART */
val = inl(emu->port + A_IOCFG);
outl (val | A_IOCFG_GPOUT2, emu->port + A_IOCFG);
udelay(10); /* udelay is a bad kludge, but remember that this is
called only once on startup */
outl (val, emu->port + A_IOCFG);
return 0;
}
I suspect that my use of udelay would make a real kernel hacker cringe,
but the level of GPOUT2 needs to remain high for a few microseconds to
provide a stable RESET signal.
Anyway, this fixes the problem. I have applied the patch for pretty much
every major upgrade of the kernel. It is sufficient to compile the module
snd-emu10k1.ko and replace it in the module tree.
- ---
+ ---
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC2: mhaidekk 2321 F.... pulseaudio
- /dev/snd/controlC1: mhaidekk 2321 F.... pulseaudio
- /dev/snd/controlC0: mhaidekk 2321 F.... pulseaudio
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC2: mhaidekk 2321 F.... pulseaudio
+ /dev/snd/controlC1: mhaidekk 2321 F.... pulseaudio
+ /dev/snd/controlC0: mhaidekk 2321 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
CurrentDesktop: KDE
DistroRelease: Ubuntu 14.04
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=b15a827a-7aa7-4add-a9b4-cb68262cfddd
InstallationDate: Installed on 2013-12-31 (161 days ago)
InstallationMedia: Kubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64
(20130822)
IwConfig:
- eth1 no wireless extensions.
-
- lo no wireless extensions.
+ eth1 no wireless extensions.
+
+ lo no wireless extensions.
MachineType: BIOSTAR Group TA970
NonfreeKernelModules: fglrx
Package: linux (not installed)
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic
root=UUID=11a18cc0-0c2e-4ce8-9acd-44c5bb8820e2 ro
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
RelatedPackageVersions:
- linux-restricted-modules-3.13.0-29-generic N/A
- linux-backports-modules-3.13.0-29-generic N/A
- linux-firmware 1.127.2
+ linux-restricted-modules-3.13.0-29-generic N/A
+ linux-backports-modules-3.13.0-29-generic N/A
+ linux-firmware 1.127.2
RfKill:
-
+
Tags: trusty
Uname: Linux 3.13.0-29-generic x86_64
UpgradeStatus: Upgraded to trusty on 2014-06-07 (3 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 01/14/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.asset.tag: None
dmi.board.name: TA970
dmi.board.vendor: BIOSTAR Group
dmi.chassis.asset.tag: None
dmi.chassis.type: 3
dmi.chassis.vendor: BIOSTAR Group
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd01/14/2013:svnBIOSTARGroup:pnTA970:pvr:rvnBIOSTARGroup:rnTA970:rvr:cvnBIOSTARGroup:ct3:cvr:
dmi.product.name: TA970
dmi.sys.vendor: BIOSTAR Group
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1328746
Title:
Soundblaster Audigy front panel MIDI fails to initialize
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