From bae5336f0aaedffa115dab9cb3d8a4e4aed3a26a Mon Sep 17 00:00:00 2001
From: Azael Avalos <coproscefalo@gmail.com>
Date: Sun, 15 Nov 2015 20:32:47 -0700
Subject: [PATCH] toshiba_acpi: Fix blank screen at boot if transflective
backlight is supported
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.
Cc: <stable@vger.kernel.org> # 4.3+
Reported-and-tested-by: Fabian Koester <fabian.koester@bringnow.com>
Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
drivers/platform/x86/toshiba_acpi.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 3aed8a4618cef..4f722aa0c7b32 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -2484,6 +2484,14 @@ static int toshiba_acpi_setup_backlight(struct toshiba_acpi_dev *dev)
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");
--
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