From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Hung Subject: [PATCH] ACPI video: ignore BIOS initial backlight value for HP m4 Date: Tue, 28 May 2013 10:05:09 +0800 Message-ID: <1369706709-9189-1-git-send-email-alex.hung@canonical.com> Return-path: Received: from youngberry.canonical.com ([91.189.89.112]:53555 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758539Ab3E1CFV (ORCPT ); Mon, 27 May 2013 22:05:21 -0400 Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: rui.zhang@intel.com, lenb@kernel.org, rjw@sisk.pl, linux-acpi@vger.kernel.org Cc: Alex Hung 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. Buglink: https://bugs.launchpad.net/bugs/1184501 Signed-off-by: Alex Hung --- drivers/acpi/video.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 5b32e15..d0937ab 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -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"), + }, + }, {} }; -- 1.8.1.2