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SubjectRe: [Fwd: Re: [Linux-usb-users] Fwd: Re: 2.6.17-rc6-mm2 - USB issues]
On Tue, 20 Jun 2006 21:21:35 +1000
Johny <> wrote:

> Firstly, apologies for a) the massive x-post and b) the time taken to
> get back to people... Please let me know where this is most
> appropriately dealt with and I'll keep it off other lists, considering
> the latest information;
> Andrew - please note - this is not a problem exclusive to the -mm
> series, on testing various combos I found it in the stock series too.

Thanks for persisting with this.

> Stock kernels break for me starting with 2.6.17-rc4 (I tested all rcs
> and also .17 itself), rc3 works a treat for using USB. I suspect the
> following line missing in dmesg for rc4 is the reason;
> -PCI: Via IRQ fixup for 0000:00:11.1, from 255 to 11

yes, that looks suspicious.

> See the following dmesg files for details;
> And the diff, for convenience;
> I have a Via chipset motherboard (for my sins), further details
> available on request, again, for convenience, the lspci;
> A couple of possible suspect patches introduced in the changelog for rc4
> were (with the first one looking particularly interesting, the others
> less interesting as I go down the list);
> [PATCH] PCI quirk: VIA IRQ fixup should only run for VIA southbridges

This one, I'd expect.

> [PATCH] x86_64: avoid IRQ0 ioapic pin collision
> [PATCH] PCI: fix via irq SATA patch
> [ALSA] via82xx - Use DXS_SRC as default for VIA8235/8237/8251 chips
> [ALSA] via82xx: tweak VT8251 workaround
> [ALSA] via82xx: add support for VIA VT8251 (AC'97)

You could try a `patch -R' of the below.

commit 75cf7456dd87335f574dcd53c4ae616a2ad71a11
Author: Chris Wedgwood <>
Date: Tue Apr 18 23:57:09 2006 -0700

[PATCH] PCI quirk: VIA IRQ fixup should only run for VIA southbridges

Alan Cox pointed out that the VIA 'IRQ fixup' was erroneously running
on my system which has no VIA southbridge (but I do have a VIA IEEE
1394 device).

This should address that. I also changed "Via IRQ" to "VIA IRQ"
(initially I read Via as a capitalized via (by way/means of).

Signed-off-by: Chris Wedgwood <>
Acked-by: Jeff Garzik <>
Signed-off-by: Greg Kroah-Hartman <>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index c42ae2c..19e2b17 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -642,13 +642,15 @@ static void quirk_via_irq(struct pci_dev
new_irq = dev->irq & 0xf;
pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
if (new_irq != irq) {
- printk(KERN_INFO "PCI: Via IRQ fixup for %s, from %d to %d\n",
+ printk(KERN_INFO "PCI: VIA IRQ fixup for %s, from %d to %d\n",
pci_name(dev), irq, new_irq);
udelay(15); /* unknown if delay really needed */
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);

* VIA VT82C598 has its device ID settable and many BIOSes

If you have trouble getting it to apply, just manually replace all the
DECLARE_PCI_FIXUP_ENABLE lines at the end of quirk_via_irq() with the
single line


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