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Subject[ 22/28] ACPI / video: ignore BIOS initial backlight value for HP Folio 13-2000
Date
3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhang Rui <rui.zhang@intel.com>

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/acpi/video.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -389,6 +389,12 @@ static int __init video_set_bqc_offset(c
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_ta
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"),
+ },
+ },
{}
};




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