From: Gustavo Maciel Dias Vieira <gustavo@xxxxxxxxx>
commit 771d09b3c4c45d4d534a83a68e6331b97fd82e15 upstream.
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@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
[wyj: Backported to 3.4: adjust context]
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
drivers/acpi/video.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 4d608fc..8c5ad89 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -471,6 +471,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 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"),
+ },
+ },
{}
};
--
1.7.1
--
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