From: Kirill Tkhai Subject: [PATCH] ACPI: video: Ignore BIOS initial backlight value for HP 250 G1 Date: Fri, 18 Oct 2013 15:56:44 +0400 Message-ID: <100851382097404@web21g.yandex.ru> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from forward16.mail.yandex.net ([95.108.253.141]:52547 "EHLO forward16.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754145Ab3JRL4r (ORCPT ); Fri, 18 Oct 2013 07:56:47 -0400 Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Cc: rjw@rjwysocki.net On HP 250 G1 laptops, BIOS reports minimum backlight on boot and causes backlight to dim completely. This ignores the initial backlight values and set to max brightness. Reference: https://bugzilla.kernel.org/show_bug.cgi?id=63111 Signed-off-by: Kirill Tkhai --- drivers/acpi/video.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 3270d3c..6456466 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -490,6 +490,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = { DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"), }, }, + { + .callback = video_ignore_initial_backlight, + .ident = "HP 250 G1", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP 250 G1 Notebook PC"), + }, + }, {} };