linux-kernel - [PATCH] ACPI: Force acpi_skip_timer_override for Gigabyte GA-MA78GPM-UD2H

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Message-ID: <1321999736.3573.10.camel@nirvana>
Date:	Wed, 23 Nov 2011 11:08:56 +1300
From:	Angus Turnbull <angus@...nhelix.com>
To:	linux-kernel@...r.kernel.org
Cc:	torvalds@...l.org, len.brown@...el.com
Subject: [PATCH] ACPI: Force acpi_skip_timer_override for Gigabyte
 GA-MA78GPM-UD2H

Several Gigabyte motherboards from the SB700 generation have an issue
where they will not boot or suspend/resume reliably without
"acpi_skip_timer_override" on the kernel command line. I have a
GA-MA78GPM-UD2H (AM2+ socket) and the below patch allows it to boot
successfully by adding it to the quirks list (the AMD bug detection in
early_quirks.c isn't enabling acpi_skip_timer_override automatically).

https://lkml.org/lkml/2011/3/31/195 covered a very similar issue.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/658955 is a bug
report with my system information.

diff -ru a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1466,6 +1466,19 @@
 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
 		     },
 	 },
+	/*
+	 * Buggy Gigabyte ACPI on SB700 boards, will not boot or resume
+	 * reliably without acpi_skip_timer_override (last stable BIOS).
+	 * Affects multiple boards of this generation.
+	 */
+	{
+	 .callback = dmi_ignore_irq0_timer_override,
+	 .ident = "Gigabyte GA-MA78GPM-UD2H",
+	 .matches = {
+		     DMI_MATCH(DMI_SYS_VENDOR,
+			"Gigabyte Technology Co., Ltd."),
+		     DMI_MATCH(DMI_PRODUCT_NAME, "GA-MA78GPM-UD2H"),
+		     },
+	 },
 	{}
 };

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