[PATCH 1/2] ACPI video: ignore BIOS backlight value for HP dm4
Alex Hung
alex.hung at canonical.com
Tue Jun 4 09:48:41 UTC 2013
From: Gustavo Maciel Dias Vieira <gustavo at sagui.org>
On a HP Pavilion dm4 laptop the BIOS sets minimum backlight on boot,
completely dimming the screen. Ignore this initial value for this
machine.
Signed-off-by: Gustavo Maciel Dias Vieira <gustavo at sagui.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
(cherry picked from commit 771d09b3c4c45d4d534a83a68e6331b97fd82e15)
Signed-off-by: Alex Hung <alex.hung at canonical.com>
---
drivers/acpi/video.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 7025e48..584f7b5 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -455,6 +455,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
},
},
+ {
+ .callback = video_ignore_initial_backlight,
+ .ident = "HP Pavilion dm4",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
+ },
+ },
{}
};
--
1.7.9.5
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