linux-kernel - [PATCH] x86 ACPI: Blacklist two HP machines with buggy BIOSes (Re: 2.6.27-rc8+

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Date:	Mon, 6 Oct 2008 11:59:29 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Jason Vas Dias <jason.vas.dias@...il.com>
Subject: [PATCH] x86 ACPI: Blacklist two HP machines with buggy BIOSes (Re: 2.6.27-rc8+ - first impressions)

On Monday, 6 of October 2008, Dmitry Torokhov wrote:
> On Mon, Oct 06, 2008 at 12:29:42AM +0200, Rafael J. Wysocki wrote:
> > On Sunday, 5 of October 2008, Dmitry Torokhov wrote:
> > > On Sun, Oct 05, 2008 at 09:19:13PM +0200, Rafael J. Wysocki wrote:
> > > > On Sunday, 5 of October 2008, Dmitry Torokhov wrote:
> > > > > On Sun, Oct 05, 2008 at 08:59:49PM +0200, Rafael J. Wysocki wrote:
> > > > > > On Sunday, 5 of October 2008, Dmitry Torokhov wrote:
> > > > > > > Hi,
> > > > > > > 
> > > > > > > Lats night I loaded 2.6.27-rc8-tip for the first time on my AMD Turion
> > > > > > > 64 laptop that is normally runs with Fedora distribution kernel.
> > > > > > > Compared to 2.6.25 the thing is broken - hdparm reports about 3MB/sec
> > > > > > > speed, fans are constantly on, everything seems sluggish.
> > > > > > > 
> > > > > > > Booting with hpet=force (HPET is disabled in BIOS) hangs the box
> > > > > > > somewhere in tty_init.
> > > > > > 
> > > > > > Is that an HP box, by chance?
> > > > > > 
> > > > > 
> > > > > Yeah, HP nx6115.
> > > > 
> > > > Oh well.
> > > > 
> > > > Please send me the output of dmidecode from it.
> > > > 
> > > 
> > > Here you go:
> > 
> > Thanks.
> > 
> > Please see if the appended patch helps.
> > 
> 
> Yep, works great, everything is zappy, hdparm reports 30Mb/s and fan is
> off. Thanks a lot!

OK, thanks for the confirmation.  Below is a changelogged version for
inclusion.

> Although I wonder why this blacklist is needed now, earlier kernels were
> able to cope with this condition.

Please see the changelog. :-)

Thanks,
Rafael

---
From: Rafael J. Wysocki <rjw@...k.pl>

x86 ACPI: Blacklist two HP machines with buggy BIOSes

There is a bug in the BIOSes of some HP boxes with AMD Turions which
connects IO-APIC pins with ACPI thermal trip points in such a way
that if the state of the IO-APIC is not as expected by the (buggy)
BIOS, the thermal trip points are set to insanely low values
(usually all of them become 16 degrees Celsius).  As a result,
thermal throttling kicks in and knock the system down to its shoes.

Unfortunately some of the recent IO-APIC changes made the bug show
up.  To prevent this from happening, blacklist machines that are
known to be affected (nx6115 and 6715b in this particular case).

This fixes http://bugzilla.kernel.org/show_bug.cgi?id=11516 listed as
a regression from 2.6.26.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Tested-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Tested-by: Jason Vas Dias <jason.vas.dias@...il.com>
---
 arch/x86/kernel/acpi/boot.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Index: linux-2.6/arch/x86/kernel/acpi/boot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/acpi/boot.c
+++ linux-2.6/arch/x86/kernel/acpi/boot.c
@@ -1605,6 +1605,14 @@ static struct dmi_system_id __initdata a
 	 */
 	{
 	 .callback = dmi_ignore_irq0_timer_override,
+	 .ident = "HP nx6115 laptop",
+	 .matches = {
+		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
+		     },
+	 },
+	{
+	 .callback = dmi_ignore_irq0_timer_override,
 	 .ident = "HP NX6125 laptop",
 	 .matches = {
 		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
@@ -1619,6 +1627,14 @@ static struct dmi_system_id __initdata a
 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
 		     },
 	 },
+	{
+	 .callback = dmi_ignore_irq0_timer_override,
+	 .ident = "HP 6715b laptop",
+	 .matches = {
+		     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
+		     },
+	 },
 	{}
 };
 
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