From 9340e1ccdf7b9b22a2be7f51cd74e8b5e11961bf Mon Sep 17 00:00:00 2001 From: Matthew Garrett Date: Tue, 1 Jul 2008 01:12:06 +0100 Subject: [PATCH] x86, ioapic, acpi quirk: disable IRQ 0 through I/O APIC for some HP systems 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 Cc: Len Brown Cc: Matthew Garrett Cc: "Rafael J. Wysocki" Signed-off-by: Ingo Molnar --- arch/x86/kernel/acpi/boot.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 92a5426539..9908ef45a6 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1426,6 +1426,17 @@ static int __init force_acpi_ht(const struct dmi_system_id *d) return 0; } +/* + * 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); + 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 @@ -1593,6 +1604,32 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = { 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"), + }, + }, {} }; -- 2.39.5