Commit 072971d7 authored by Len Brown's avatar Len Brown
Browse files

ACPI: disable _OSI(Linux) by default 

In Linux-2.6.22 we expanded the boot parameter osi=
so that it can enable and !enable an OSI string.

_OSI(Linux) is a special case because we know that there
are both systems that require it set, and systems
require that it _not_ to be set.  In the long term it can't
be set, for the same reason _OS(Linux) can't be enabled --
it tends to confuse BIOS that are not properly
validated with Linux.  Further, the semantics and version
information of _OSI(Linux) were never actually defined.

The kernel prints out a message if it sees _OSI(Linux)
requested, and there is a DMI workaround to invoke
"osi=Linux" automatically for existing systems that need it.

http://bugzilla.kernel.org/show_bug.cgi?id=7787



Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 85f6038f

drivers/acpi/osl.c

+1 −37
Original line number Diff line number Diff line
@@ -77,13 +77,7 @@ static struct workqueue_struct *kacpi_notify_wq; 
#define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */

static char osi_additional_string[OSI_STRING_LENGTH_MAX];



#define OSI_LINUX_ENABLED

#ifdef	OSI_LINUX_ENABLED

int osi_linux = 1;	/* enable _OSI(Linux) by default */

#else

int osi_linux;		/* disable _OSI(Linux) by default */

#endif





#ifdef CONFIG_DMI

static struct __initdata dmi_system_id acpi_osl_dmi_table[];
@@ -1183,17 +1177,10 @@ acpi_os_validate_interface (char *interface) 
	if (!strcmp("Linux", interface)) {

		printk(KERN_WARNING PREFIX

			"System BIOS is requesting _OSI(Linux)\n");

#ifdef	OSI_LINUX_ENABLED

		printk(KERN_WARNING PREFIX

			"Please test with \"acpi_osi=!Linux\"\n"

			"Please send dmidecode "

			"to linux-acpi@vger.kernel.org\n");

#else

		printk(KERN_WARNING PREFIX

			"If \"acpi_osi=Linux\" works better,\n"

			"Please send dmidecode "

			"to linux-acpi@vger.kernel.org\n");

#endif

		if(osi_linux)

			return AE_OK;

	}
@@ -1227,36 +1214,14 @@ acpi_os_validate_address ( 
}



#ifdef CONFIG_DMI

#ifdef	OSI_LINUX_ENABLED

static int dmi_osi_not_linux(struct dmi_system_id *d)

{

	printk(KERN_NOTICE "%s detected: requires not _OSI(Linux)\n", d->ident);

	enable_osi_linux(0);

	return 0;

}

#else

static int dmi_osi_linux(struct dmi_system_id *d)

{

	printk(KERN_NOTICE "%s detected: requires _OSI(Linux)\n", d->ident);

	printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident);

	enable_osi_linux(1);

	return 0;

}

#endif



static struct dmi_system_id acpi_osl_dmi_table[] __initdata = {

#ifdef	OSI_LINUX_ENABLED

	/*

	 * Boxes that need NOT _OSI(Linux)

	 */

	{

	 .callback = dmi_osi_not_linux,

	 .ident = "Toshiba Satellite P100",

	 .matches = {

		     DMI_MATCH(DMI_BOARD_VENDOR, "TOSHIBA"),

		     DMI_MATCH(DMI_BOARD_NAME, "Satellite P100"),

		     },

	 },

#else

	/*

	 * Boxes that need _OSI(Linux)

	 */
@@ -1268,7 +1233,6 @@ static struct dmi_system_id acpi_osl_dmi_table[] __initdata = { 
		     DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),

		     },

	 },

#endif

	{}

};

#endif /* CONFIG_DMI */

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