Commit fedbe9bc authored May 28, 2013 by Alex Hung Committed by Rafael J. Wysocki Jun 01, 2013

ACPI / video: ignore BIOS initial backlight value for HP m4

On HP m4 lapops, BIOS reports minimum backlight on boot and
causes backlight to dim completely. This ignores the initial backlight
values and set to max brightness.

References: https://bugs.launchpad.net/bugs/1184501


Cc: All <stable@vger.kernel.org>
Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent af1d486c

drivers/acpi/video.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -464,6 +464,14 @@ 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 m4",
		.matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
		},
		},
		{}
		};