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 ea45ea7 (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>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index a40412776804..9515f18898b2 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -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.