From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail333.us4.mandrillapp.com ([205.201.137.77]:58947 "EHLO mail333.us4.mandrillapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752058AbcCAVnH (ORCPT ); Tue, 1 Mar 2016 16:43:07 -0500 Received: from pmta03.dal05.mailchimp.com (127.0.0.1) by mail333.us4.mandrillapp.com id hqo6em174no0 for ; Tue, 1 Mar 2016 21:42:50 +0000 (envelope-from ) From: Subject: Patch "toshiba_acpi: Fix blank screen at boot if transflective backlight is supported" has been added to the 4.4-stable tree To: , , , Cc: , Message-Id: <1456868567244139@kroah.com> Date: Tue, 01 Mar 2016 21:42:50 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled toshiba_acpi: Fix blank screen at boot if transflective backlight is supported to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: toshiba_acpi-fix-blank-screen-at-boot-if-transflective-backlight-is-supported.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From bae5336f0aaedffa115dab9cb3d8a4e4aed3a26a Mon Sep 17 00:00:00 2001 From: Azael Avalos Date: Sun, 15 Nov 2015 20:32:47 -0700 Subject: toshiba_acpi: Fix blank screen at boot if transflective backlight is supported From: Azael Avalos commit bae5336f0aaedffa115dab9cb3d8a4e4aed3a26a upstream. If transflective backlight is supported and the brightness is zero (lowest brightness level), the set_lcd_brightness function will activate the transflective backlight, making the LCD appear to be turned off. This patch fixes the issue by incrementing the brightness level, and by doing so, avoiding the activation of the tranflective backlight. Reported-and-tested-by: Fabian Koester Signed-off-by: Azael Avalos Signed-off-by: Darren Hart Signed-off-by: Greg Kroah-Hartman --- drivers/platform/x86/toshiba_acpi.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/platform/x86/toshiba_acpi.c +++ b/drivers/platform/x86/toshiba_acpi.c @@ -2484,6 +2484,14 @@ static int toshiba_acpi_setup_backlight( brightness = __get_lcd_brightness(dev); if (brightness < 0) return 0; + /* + * If transflective backlight is supported and the brightness is zero + * (lowest brightness level), the set_lcd_brightness function will + * activate the transflective backlight, making the LCD appear to be + * turned off, simply increment the brightness level to avoid that. + */ + if (dev->tr_backlight_supported && brightness == 0) + brightness++; ret = set_lcd_brightness(dev, brightness); if (ret) { pr_debug("Backlight method is read-only, disabling backlight support\n"); Patches currently in stable-queue which might be from coproscefalo@gmail.com are queue-4.4/toshiba_acpi-fix-blank-screen-at-boot-if-transflective-backlight-is-supported.patch