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    SubjectRe: 2.6.22-rc5 regression
    On 2007.06.20 01:37:16 +0000, Carlo Wood wrote:
    > The result of this patch is that the kernel starts to print
    > "agpgart: Detected an Intel 965G Chipset." again with the usual
    > disastrous results. Now, that doesn't mean that this patch is
    > wrong - but it explains why the problem returns after this patch.
    >

    Yep, the device table patch doesn't change any function, so your problem
    started from when 965G support patch has been in kernel.

    Carlo, pls try a kernel param of "pci=nommconf" to see if that could
    fix your hang. There might be a BIOS bug, as similar issue also happen
    like https://bugzilla.novell.com/show_bug.cgi?id=228683

    I think for i965 we could have following patch to fix this, we may
    fail if no IGD device got detected.

    Signed-off-by: Wang Zhenyu <zhenyu.z.wang@intel.com>
    ---
    diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
    index 0439ee9..5a54a9c 100644
    --- a/drivers/char/agp/intel-agp.c
    +++ b/drivers/char/agp/intel-agp.c
    @@ -1855,15 +1855,15 @@ static const struct intel_driver_description {
    { PCI_DEVICE_ID_INTEL_82946GZ_HB, PCI_DEVICE_ID_INTEL_82946GZ_IG, 0, "946GZ",
    &intel_845_driver, &intel_i965_driver },
    { PCI_DEVICE_ID_INTEL_82965G_1_HB, PCI_DEVICE_ID_INTEL_82965G_1_IG, 0, "965G",
    - &intel_845_driver, &intel_i965_driver },
    + NULL, &intel_i965_driver },
    { PCI_DEVICE_ID_INTEL_82965Q_HB, PCI_DEVICE_ID_INTEL_82965Q_IG, 0, "965Q",
    - &intel_845_driver, &intel_i965_driver },
    + NULL, &intel_i965_driver },
    { PCI_DEVICE_ID_INTEL_82965G_HB, PCI_DEVICE_ID_INTEL_82965G_IG, 0, "965G",
    - &intel_845_driver, &intel_i965_driver },
    + NULL, &intel_i965_driver },
    { PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GM_IG, 1, "965GM",
    - &intel_845_driver, &intel_i965_driver },
    + NULL, &intel_i965_driver },
    { PCI_DEVICE_ID_INTEL_82965GM_HB, PCI_DEVICE_ID_INTEL_82965GME_IG, 0, "965GME/GLE",
    - &intel_845_driver, &intel_i965_driver },
    + NULL, &intel_i965_driver },
    { PCI_DEVICE_ID_INTEL_7505_0, 0, 0, "E7505", &intel_7505_driver, NULL },
    { PCI_DEVICE_ID_INTEL_7205_0, 0, 0, "E7205", &intel_7505_driver, NULL },
    { PCI_DEVICE_ID_INTEL_G33_HB, PCI_DEVICE_ID_INTEL_G33_IG, 0, "G33",
    @@ -1917,6 +1917,7 @@ static int __devinit agp_intel_probe(struct pci_dev *pdev,
    }

    if (bridge->driver == NULL) {
    + /* The bridge has no AGP or no gfx device */
    printk(KERN_WARNING PFX "Failed to find bridge device "
    "(chip_id: %04x)\n", intel_agp_chipsets[i].gmch_chip_id);
    agp_put_bridge(bridge);
    ---
    -
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