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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> > 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> > 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 > > > > > > > > >
