From e4f2e3f0ea13cf3424c0f23d01424c68a428333b Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@kernel.org>
Date: Wed, 17 Feb 2016 12:38:07 -0800
Subject: [PATCH] platform/x86: dell-wmi: Add a better description for "stealth mode"
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Git-commit: e4f2e3f0ea13cf3424c0f23d01424c68a428333b
Patch-mainline: v4.13-rc1
References: FATE#325842

This is based on Mario's explanation and observation of my laptop.

Suggested-by: "Pali Rohár" <pali.rohar@gmail.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Mario Limonciello <mario_limonciello@dell.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/platform/x86/dell-wmi.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -272,7 +272,12 @@ static const struct key_entry dell_wmi_k
 	/* RGB keyboard backlight control */
 	{ KE_IGNORE, 0x154, { KEY_RESERVED } },
 
-	/* Stealth mode toggle */
+	/*
+	 * Stealth mode toggle. This will "disable all lights and sounds".
+	 * The action is performed by the BIOS and EC; the WMI event is just
+	 * a notification. On the XPS 13 9350, this is Fn+F7, and there's
+	 * a BIOS setting to enable and disable the hotkey.
+	 */
 	{ KE_IGNORE, 0x155, { KEY_RESERVED } },
 
 	/* Rugged magnetic dock attach/detach events */