[Bionic] [PATCH] platform/x86: dell-wmi: Ignore new keyboard backlight change event

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1817063

There's a new wmi event generated by dell-wmi when pressing keyboard
backlight hotkey:
[ 3285.474172] dell_wmi: Unknown key with type 0x0010 and code 0x003f pressed

This event is for notification purpose, let's ignore it. The keyboard
backlight hotkey uses another event so it still works without event
0x3f.

Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Reviewed-by: Pali Rohár <pali.rohar at gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
(backported from commit 38f250b7d4a04f61bab4aeee3cb86908744f188d linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/platform/x86/dell-wmi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 3a920381cccd..c6db5410791b 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -267,6 +267,9 @@ static const struct key_entry dell_wmi_keymap_type_0010[] = {
 	/* Fn-lock switched to multimedia keys */
 	{ KE_IGNORE, 0x1, { KEY_RESERVED } },
 
+	/* Keyboard backlight change notification */
+	{ KE_IGNORE, 0x3f, { KEY_RESERVED } },
+
 	/* Fn-lock */
 	{ KE_IGNORE, 0x151, { KEY_RESERVED } },
 
-- 
2.17.1