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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>
Subject: [PATCH 5.4 197/232] Input: i8042 - add Acer Aspire 5738z to nomux list
Date:   Thu, 16 Apr 2020 15:24:51 +0200
Message-Id: <20200416131339.839053626@linuxfoundation.org>
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From: Hans de Goede <hdegoede@redhat.com>

commit ebc68cedec4aead47d8d11623d013cca9bf8e825 upstream.

The Acer Aspire 5738z has a button to disable (and re-enable) the
touchpad next to the touchpad.

When this button is pressed a LED underneath indicates that the touchpad
is disabled (and an event is send to userspace and GNOME shows its
touchpad enabled / disable OSD thingie).

So far so good, but after re-enabling the touchpad it no longer works.

The laptop does not have an external ps2 port, so mux mode is not needed
and disabling mux mode fixes the touchpad no longer working after toggling
it off and back on again, so lets add this laptop model to the nomux list.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200331123947.318908-1-hdegoede@redhat.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/input/serio/i8042-x86ia64io.h |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -530,6 +530,17 @@ static const struct dmi_system_id __init
 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo LaVie Z"),
 		},
 	},
+	{
+		/*
+		 * Acer Aspire 5738z
+		 * Touchpad stops working in mux mode when dis- + re-enabled
+		 * with the touchpad enable/disable toggle hotkey
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
+		},
+	},
 	{ }
 };