Patching sound module to add mixer map in alsa

[florut]

Hi,

I'm running VL 5.9 GOLD DLX edition kernel 2.6.22.14

I have an USB external 5.1 sound card "Hercules Gamesurround Muse Pocket USB LT" (from Guillemot) which is recognized by default by kernel but...

root:# ls -l /dev/snd/
total 0
crw-rw-rw- 1 root audio 116,  0 2008-01-30 21:46 controlC0
crw-rw-rw- 1 root audio 116, 32 2008-01-30 20:47 controlC1
crw-rw--w- 1 root audio 116, 24 2008-01-30 21:46 pcmC0D0c
crw-rw-rw- 1 root audio 116, 16 2008-01-30 21:46 pcmC0D0p
crw-rw--w- 1 root audio 116, 56 2008-01-30 20:47 pcmC1D0c
crw-rw-rw- 1 root audio 116, 48 2008-01-30 20:47 pcmC1D0p
crw-rw-rw- 1 root audio 116, 49 2008-01-30 20:47 pcmC1D1p
crw-rw--w- 1 root audio 116, 58 2008-01-30 20:47 pcmC1D2c
crw-rw-rw- 1 root audio 116,  1 2008-01-30 20:47 seq
crw-rw-rw- 1 root audio 116, 33 2008-01-30 21:46 timer


root:# lsusb
Bus 2 Device 2: ID 06f8:c000 Guillemot Corp.
...

root:# lsmod | grep usb
snd_usb_audio          74336  0
snd_pcm                69256  3 snd_hda_intel,snd_pcm_oss,snd_usb_audio
snd_usb_lib            14336  1 snd_usb_audio
snd_rawmidi            19104  1 snd_usb_lib
snd_hwdep               6788  1 snd_usb_audio
snd                    43364  11 snd_hda_intel,snd_seq_oss,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_usb_audio,snd_pcm,snd_timer,snd_rawmidi,snd_seq_device,snd_hwdep

root:# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Audio [USB Audio], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

...but works only in 2.0 stereo mode . Impossible to get the other channels to work (with alsa tricks), no mixer entries for the other channels.

root:# amixer scontrols
Simple mixer control 'Master',0
Simple mixer control 'Line',0
Simple mixer control 'Mic',0
Simple mixer control 'Mic Capture',0

A patch has been released to fix this problem http://www.spinics.net/lists/alsa-devel/msg00304.html which i applied manually (there is no reason for it not to work !) to vector 2.6.22.14 kernel recompiled with default config (I just changed the processor type, left alsa/oss option activated as modules) 
Well, after recompiling my kernel nothing has changed at all. I know the patch is good because someone made it work (but do not say how he made it) and the card id is correctly set (same as lsusb output)

Code:

       {
               /* Hercules Gamesurround Muse Pocket LT*/
               .id = USB_ID(0x06f8, 0xc000),
               .map = hercules_gamesurround_muse_pocket_lt_map,
               .selector_map = hercules_gamesurround_muse_pocket_lt_selectors_map,
               .ignore_ctl_error = 1,
       },

Did I miss some config after of before compiling ?
Has anything have to be activated or configured in alsa config so the mixer map is applied ??

[bigpaws]

In the documentation there should be some
instruction on getting the module loaded.

example modprobe <name of module>

Use lsmod to see if the modules is loaded.

HTH

Bigpaws

[The Headacher]

Well, after recompiling my kernel nothing has changed at all. I know the patch is good because someone made it work (but do not say how he made it) and the card id is correctly set (same as lsusb output)

Have you recompiled just the kernel (make), or have you also recompiled the modules (make modules) and installed them (make modules_install {or modules-install, I forgot} )?

Has anything have to be activated or configured in alsa config so the mixer map is applied ??

You could try running alsa-config, but I'm not sure that'll work. If not, you might (not sure about this) get it to work with tweaking /usr/share/alsa/alsa.conf or one of the other files in that directory, but that is probably far too complicated for anyone who isn't an alsa coder, if possible at all.

[florut]

Thanks for your answers guys ! 

Have you recompiled just the kernel (make), or have you also recompiled the modules (make modules) and installed them (make modules_install {or modules-install, I forgot} )?

I recompiled using the provided doc in kernel sources which gives something like that :
make mrproper + make config + make + make modules_install + reconfiguration of lilo...
+ I copied /usr/src/linux-xx/System.map to overwrite the one placed in /boot directory (i do not understand the point of doing this, not everyone recommands to do this, but as I do not know what is this System.map file for...)

You could try running alsa-config, but I'm not sure that'll work. If not, you might (not sure about this) get it to work with tweaking /usr/share/alsa/alsa.conf or one of the other files in that directory, but that is probably far too complicated for anyone who isn't an alsa coder, if possible at all.

Indeed it looks a bit complicated to understand !!

I forgot to mention something : my usb card is not recognised at all by alsaconf...

In the documentation there should be some
instruction on getting the module loaded.

example modprobe <name of module>

Use lsmod to see if the modules is loaded.

HTH

Bigpaws

See in my first post, i've pasted an lsmod output... The right one is snd_usb_audio.