Subject: Re: [linux-audio-user] audiophile 2496 - spdif in
From: Clemens Ladisch (clemens_AT_ladisch.de)
Date: Fri Oct 10 2003 - 11:28:38 EEST
wes schreiner wrote:
> The support for using lspci/setpci is in all 2.4.x kernels I think, but
> it doesn't always do what you want. I have a Zoran 36057 video capture
> device sitting on IRQ 10, same as my sound card. IRQ 9 is unused (no
> ACPI), so I just tried "setpci -v -s 03:09.0 INTERRUPT_LINE=09" to
> change its IRQ. lspci -v still says it is at IRQ 10, but lspci -b -v
> says it is at IRQ 9. Which is it? OK, I modprobe zr36067 and the module
> loads, and now both lspci -v and lspci -v -b agree that the Zoran chip
> is at IRQ 10, so nothing changed.
The interrupt_line register doesn't affect the card in any way, it's
there for information purposes only. The BIOS sets this register so
that drivers know which interrupt to use.
To change the interrupt routing, you have to reprogram some registers
of the PCI controller (starting at 60h in Intel's ICHx southbridges
IIRC, but read Intel's datasheet first). And I don't know if the
kernel is able to realize that the interrupt has changed.
HTH
Clemens
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