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    Subject[PATCH 2/2] acpi: Disable IRQ 0 through I/O APIC for some HP systems
    From: Matthew Garrett <mjg59@srcf.ucam.org>

    Some HP laptops have a problem with their DSDT reporting as
    HP/SB400/10000, which includes some code which overrides all temperature
    trip points to 16C if the INTIN2 input of the I/O APIC is enabled. This
    input is incorrectly designated the ISA IRQ 0 via an interrupt source
    override even though it is wired to the output of the master 8259A and
    INTIN0 is not connected at all. So far two models have been identified,
    namely nx6125 and nx6325.

    Use a knob provided by the I/O APIC interrupt registration code to
    abandon any attempts to route IRQ 0 through the I/O APIC for these
    systems.

    Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
    ---
    Hello,

    Matthew, you have not added your sign-off with the original patch, please
    do so now.

    Rafael, please try this change together with
    patch-2.6.26-rc1-20080505-mpparse-acpi-noirq0-2 and see if this fixes your
    system.

    I have tried the patches with a wildcard entry added to acpi_dmi_table[]
    so that it trips for my system. The result is as follows:

    ENABLING IO-APIC IRQs
    ..TIMER: vector=0x31 apic1=-1 pin1=-1 apic2=-1 pin2=-1
    ...trying to set up timer as Virtual Wire IRQ... works.

    (note the absence of any timer pin), which means the changes work as
    expected. Here the timer has been set up as a native local APIC interrupt
    routed through the 8259A set up as a "virtual wire".

    Ingo, please apply the two patches where appropriate.

    Maciej

    patch-2.6.26-rc1-20080505-mjg59-acpi-noirq0-0
    diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/acpi/boot.c linux-2.6.26-rc1-20080505/arch/x86/kernel/acpi/boot.c
    --- linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/acpi/boot.c 2008-05-05 02:55:24.000000000 +0000
    +++ linux-2.6.26-rc1-20080505/arch/x86/kernel/acpi/boot.c 2008-06-30 23:31:48.000000000 +0000
    @@ -1049,6 +1049,17 @@ static int __init force_acpi_ht(const st
    }

    /*
    + * Don't register any I/O APIC entries for the 8254 timer IRQ.
    + */
    +static int __init
    +dmi_disable_irq0_through_ioapic(const struct dmi_system_id *d)
    +{
    + pr_notice("%s detected: disabling IRQ 0 through I/O APIC\n", d->ident);
    + set_disable_irq0_through_ioapic(1);
    + return 0;
    +}
    +
    +/*
    * If your system is blacklisted here, but you find that acpi=force
    * works for you, please contact acpi-devel@sourceforge.net
    */
    @@ -1215,6 +1226,32 @@ static struct dmi_system_id __initdata a
    DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
    },
    },
    + /*
    + * HP laptops which use a DSDT reporting as HP/SB400/10000,
    + * which includes some code which overrides all temperature
    + * trip points to 16C if the INTIN2 input of the I/O APIC
    + * is enabled. This input is incorrectly designated the
    + * ISA IRQ 0 via an interrupt source override even though
    + * it is wired to the output of the master 8259A and INTIN0
    + * is not connected at all. Abandon any attempts to route
    + * IRQ 0 through the I/O APIC therefore.
    + */
    + {
    + .callback = dmi_disable_irq0_through_ioapic,
    + .ident = "HP NX6125 laptop",
    + .matches = {
    + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
    + DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
    + },
    + },
    + {
    + .callback = dmi_disable_irq0_through_ioapic,
    + .ident = "HP NX6325 laptop",
    + .matches = {
    + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
    + DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
    + },
    + },
    {}
    };


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