Commit 94fb9823 authored Aug 25, 2013 by Felipe Contreras Committed by Rafael J. Wysocki Aug 25, 2013

ACPI: blacklist win8 OSI for buggy laptops

Since v3.7 the acpi backlight driver doesn't work correctly in several
machines because ACPI code has different code for Windows 8, and the
rest.

The commit ea45ea70 (in v3.11-rc2) tried to fix this problem by using the
intel backlight driver, however it introduced several other issues in
different machines.

This patch fixes both regressions by blacklisting the win8 OSI, so we
are back to v3.6 behavior, and it should remain that way until the intel
backlight driver is fixed.

Since v3.7, users have been forced to fix the initial regression by
modifying the boot arguments (acpi_osi="!Windows 2012").

Once the Intel backlight driver works correctly for all machines, this
blacklist can be removed and that driver can be used instead.

References: https://bugzilla.kernel.org/show_bug.cgi?id=60682


Reported-by: Danny Baumann <dannybaumann@web.de>
Reported-by: Philipp Richter <richterphilipp.pops@gmail.com>
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent cb7a386c

drivers/acpi/blacklist.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -281,6 +281,22 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
		DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
		},
		},
		{
		.callback = dmi_disable_osi_win8,
		.ident = "Dell Inspiron 15R SE",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
		},
		},
		{
		.callback = dmi_disable_osi_win8,
		.ident = "Lenovo ThinkPad Edge E530",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
		},
		},

		/*
		* BIOS invocation of _OSI(Linux) is almost always a BIOS bug.

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