Commit 789eeea1 authored Sep 19, 2014 by Aaron Lu Committed by Rafael J. Wysocki Sep 22, 2014

ACPI / video: disable native backlight for ThinkPad X201s

The ThinkPad X201s has a working ACPI video backlight interface and is
shipped before Win8; then there is BIOS update that starts to query
_OSI("Windows 2012") and that would make our video module stop creating
backlight interface and caused problem for the user. Add it to the DMI
table to disable native backlight to fix this problem.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=81691
Link: https://bugzilla.kernel.org/show_bug.cgi?id=51231


Cc: 3.16+ <stable@vger.kernel.org> # 3.16+
Reported-and-tested-by: Yves-Alexis Perez <corsac@debian.org>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 0f33be00

drivers/acpi/video.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -750,6 +750,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
		},
		},
		{
		.callback = video_disable_native_backlight,
		.ident = "ThinkPad X201s",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
		},
		},

		/* The native backlight controls do not work on some older machines */
		{

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