[arch-general] Multiple sound cards

[Stephen Wilkinson]

OK, it's all explained in the source code referred to by Johannes Goecke
(see above).
In version 2.6.23 a "catch all VIA VT8237" function was used to enable the
on-board sound card -- which is why it worked for me. In version 2.6.24 this
was removed. Instead the DMI code (
http://en.wikipedia.org/wiki/Desktop_Management_Interface) is used to enable
the card *only* on MSI K8T Neo2 FIR. So once I've found the DMI code for my
motherboard, I'll try a patch on the 2.6.24 kernel and post again if it
works.

Steve

On 20/04/2008, Stephen Wilkinson <sw8511 at gmail.com> wrote:
>
> I thought I'd check the changelog for 2.6.24 on www.kernel.org
> (http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.24) and
> found this:
>
>
> --------------8<----------------------------------------------------------------------------------------------------------------
> commit 346ca04d050ac48ceb8e4a6b1c76c2d7fd5d1a6a
> Author: Johannes Goecke <goecke at upb.de>
> Date:   Mon Sep 10 10:46:52 2007 +0200
>
>     PCI: re-enable onboard sound on "MSI K8T Neo2-FIR"
>
>     On the "MSI K8T Neo2-FIR" board the BIOS disables the onboard
>     soundcard, if a second PCI soundcard is present.
>
>     This patch sets the korrect register bit to enable the onboard sound.
>
>     Removed old code in /drivers/pci/quirks.c that only checks for the
>     PCI-ID and fires on any Board with VIA 8237.
>
>     New code in /arch/i386/pci/fixup.c checks the DMI-tables and only runs
>     on the specific board.
>
> --------------8<----------------------------------------------------------------------------------------------------------------
>
> My board is an MSI K8TM ILSR so this sounds a promising thing to look
> at... will post back if I have any luck, in case anybody else is
> interested.
>
> Steve
>
>
> On 20/04/2008, Stephen Wilkinson <sw8511 at gmail.com> wrote:
> > Thanks Karolina,
> >
> >  I'd noticed that too, that the kernel (from 2.6.17 til 2.6.23)
> >  detected the on-board sound card even when it was set to "disabled" in
> >  the BIOS. I double checked the BIOS setting, and it is definitely
> >  enabled.
> >
> >  Before kernel 2.6.17 I couldn't get the two cards working
> >  simultaneously... hmm, I wonder if a "feature" (read bug!) that made
> >  my setup work has been fixed!
> >
> >  Can the on-board be disabled by the presence of another sound card
> >  (over-riding the BIOS setting)?
> >
> >  Steve
> >
> >
> >  On 20/04/2008, Karolina Lindqvist <karolina.lindqvist at kramnet.se>
> wrote:
> >  > söndagen den 20 april 2008 skrev Stephen Wilkinson:
> >  >
> >  >
> >  >  > Does anyone have any suggestions as to why this may have stopped
> >  >  > working in moving from 2.6.23 to 2.6.24? Is it no longer possible
> to
> >  >  > run two sound cards together?
> >  >
> >  >
> >  > I got the same problem with my (only) built-in VIA sound chip. From
> kernel
> >  >  2.6.24 and onwards, the chip has to be enabled in the bios.  I had
> it
> >  >  disabled before.
> >  >  Check your bios settings, and enable the card if it is disabled.
> >  >
> >  >  Before linux ignored bios settings, but it look likes it does not do
> that
> >  >  anymore.
> >  >
> >  >
> >  >  Karolina
> >  >
> >  >
> >
>
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