ACPI / video: ignore BIOS initial backlight value for HP Folio 13-2000

commit 129ff8f8d58297b04f47b5d6fad81aa2d08404e1 upstream.

Or else the laptop will boot with a dimmed screen.

References: https://bugzilla.kernel.org/show_bug.cgi?id=51141
Tested-by: Stefan Nagy <public@stefan-nagy.at>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 08a44b5..0e47949 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -389,6 +389,12 @@ static int __init video_set_bqc_offset(const struct dmi_system_id *d)
        return 0;
 }
 
+static int video_ignore_initial_backlight(const struct dmi_system_id *d)
+{
+       use_bios_initial_backlight = 0;
+       return 0;
+}
+
 static struct dmi_system_id video_dmi_table[] __initdata = {
        /*
         * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
@@ -433,6 +439,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
                },
        },
+       {
+        .callback = video_ignore_initial_backlight,
+        .ident = "HP Folio 13-2000",
+        .matches = {
+               DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+               DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
+               },
+       },
        {}
 };