ACPI / video: Add force native backlight quirk for Lenovo Ideapad Z570

The Lenovo Ideapad Z570 (which is an Acer in disguise like some other Ideapads)
has a broken acpi_video interface, this was fixed in commmit a11d342fb8
("ACPI / video: force vendor backlight on Lenovo Ideapad Z570").

Which stops acpi_video from registering a backlight interface, but this is
only a partial fix, because for people who have the ideapad-laptop module
installed that module will now register a backlight interface, which also
does not work, so we need to use the native intel_backlight interface.

The Lenovo Ideapad 570 is a pre-win8 laptop / too old for the acpi-video code
to automatically prefer the native backlight interface, so add a quirk for it.

This commit also removes the previous incomplete fix.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1187004
Tested-by: Be <be.0@gmx.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 2f45dca31724..cc79d3fedfb2 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -425,6 +425,12 @@ static int __init video_disable_native_backlight(const struct dmi_system_id *d)
         return 0;
 }
 
+static int __init video_enable_native_backlight(const struct dmi_system_id *d)
+{
+        use_native_backlight_dmi = NATIVE_BACKLIGHT_ON;
+        return 0;
+}
+
 static struct dmi_system_id video_dmi_table[] __initdata = {
         /*
          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -566,6 +572,17 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
                 },
         },
+
+        /* Non win8 machines which need native backlight nevertheless */
+        {
+         /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
+         .callback = video_enable_native_backlight,
+         .ident = "Lenovo Ideapad Z570",
+         .matches = {
+                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+                DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
+                },
+        },
         {}
 };