[linux-audio-user] emu10k1 multichannel support

[Fernando Lopez-Lezcano]

On Thu, 2005-01-20 at 17:03, Shayne O'Connor wrote:
> Lee Revell wrote:
> >On Fri, 2005-01-21 at 10:19 +1100, Shayne O'Connor wrote:
> >>Lee Revell wrote:
> >>>You're sure you have the correct ALSA modules loaded?  Maybe you have
> >>>ALSA modules built into the kernel that are interfering.  Or maybe you
> >>>need to run the snddevices.sh script.
> >>>
> >>>What is in /proc/asound/devices?
> >>>
> >>[mrmachine at localhost mrmachine]$ cat /proc/asound/devices
> >>  4: [0- 0]: hardware dependent
> >>  8: [0- 0]: raw midi
> >> 18: [0- 2]: digital audio playback
> >> 26: [0- 2]: digital audio capture
> >> 25: [0- 1]: digital audio capture
> >> 16: [0- 0]: digital audio playback
> >> 24: [0- 0]: digital audio capture
> >>  0: [0- 0]: ctl
> >>  1:       : sequencer
> >>  6: [0- 2]: hardware dependent
> >>  9: [0- 1]: raw midi
> >> 10: [0- 2]: raw midi
> >> 33:       : timer
> >
> >That's wrong.  You must have ALSA built into your kernel and it's
> >interfering.  Or you didn't apply the patch correctly.  It should look
> >like this:
> >
> what's the proper way to apply the patch?
> 
> i cd'd to the alsa-driver source directory and did this:
> 
> "patch -p1 < ../emu10k1-multichannel-v002.patch"
> 
> and it gave output saying that it patched successfully.
> 
> then i did "make; sudo make install", ran the snddevices script, then ran:
> 
> "/sbin/modprobe snd-emu10k1;/sbin/modprobe snd-pcm-oss;/sbin/modprobe
> snd-mixer-oss;/sbin/modprobe snd-seq-oss"
>
> i'm using a fedora core 2 planet ccrma installation - the ccrma stuff
> was installed over my original fc2 install via apt ... i think the
> default fc2 install compiles alsa into the kernel, but the ccrma
> packages build alsa as a module?

:-) Both, see below...

> but, then again, i'm using the ccrma patched 2.6.10 kernel, so i don't
> think that alsa would have been compiled into that version ...
> 
> maybe my problem was only re-compiling and installing the alsa-driver
> package and not the others as well?

Caveat: For a normal Planet CCRMA FC2/3 install there are two locations
for the ALSA kernel modules. One is the one that comes with the kernel
itself. But Planet CCRMA also supplies a more up to date version of
ALSA, and those kernel modules are installed in:
  /lib/modules/`uname -r`/updates/
They override (ie: they are first in the modprobe search order) the ones
in the kernel. So if you do a normal alsa kernel modules install you
will overwrite the modules in the kernel tree, not the updates, and then
if you reload the module you will still get the one in the "updates"
directory. 

So... you want to overwrite the updated modules, and you can do that by
supplying the proper flag to the alsa driver configure process:

    --with-moddir=/lib/modules/KERNEL_VERSION/updates

With this added the install will overwrite the updated modules
(installed through the kernel-module-alsa package for your kernel
version). A subsequenct /sbin/depmod -a and /sbin/modprobe whatever
should bring in the new version (provided you unload the modules first,
of course). 

-- Fernando