[ 22/28] ACPI / video: ignore BIOS initial backlight value for HP Folio 13-2000
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2012-12-14 22:32:27
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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 <redacted> Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <redacted> 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"), + }, + }, {} };