linux-kernel - [PATCH 3.16 175/245] platform/x86: asus-wmi: Fix keyboard brightness cannot be set to 0

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Date:   Fri, 24 Apr 2020 00:06:42 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Daniel Drake" <drake@...lessm.com>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        "Jian-Hong Pan" <jian-hong@...lessm.com>
Subject: [PATCH 3.16 175/245] platform/x86: asus-wmi: Fix keyboard
 brightness cannot be set to 0

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jian-Hong Pan <jian-hong@...lessm.com>

commit 176a7fca81c5090a7240664e3002c106d296bf31 upstream.

Some of ASUS laptops like UX431FL keyboard backlight cannot be set to
brightness 0. According to ASUS' information, the brightness should be
0x80 ~ 0x83. This patch fixes it by following the logic.

Fixes: e9809c0b9670 ("asus-wmi: add keyboard backlight support")
Signed-off-by: Jian-Hong Pan <jian-hong@...lessm.com>
Reviewed-by: Daniel Drake <drake@...lessm.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/platform/x86/asus-wmi.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -386,13 +386,7 @@ static void kbd_led_update(struct work_s
 
 	asus = container_of(work, struct asus_wmi, kbd_led_work);
 
-	/*
-	 * bits 0-2: level
-	 * bit 7: light on/off
-	 */
-	if (asus->kbd_led_wk > 0)
-		ctrl_param = 0x80 | (asus->kbd_led_wk & 0x7F);
-
+	ctrl_param = 0x80 | (asus->kbd_led_wk & 0x7F);
 	asus_wmi_set_devstate(ASUS_WMI_DEVID_KBD_BACKLIGHT, ctrl_param, NULL);
 }