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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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