linux-kernel - [PATCH] Input: i8042 - add Fujitsu Lifebook U728 to i8042 quirk table

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Message-ID: <20231017151114.99135-2-szfabian@bluemarch.art>
Date:   Tue, 17 Oct 2023 15:15:21 +0000
From:   Szilard Fabian <szfabian@...emarch.art>
To:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        dmitry.torokhov@...il.com
Cc:     Szilard Fabian <szfabian@...emarch.art>
Subject: [PATCH] Input: i8042 - add Fujitsu Lifebook U728 to i8042 quirk table

Another Fujitsu-related patch.

In the initial boot stage the integrated keyboard of Fujitsu Lifebook U728
refuses to work and it's not possible to type for example a dm-crypt
passphrase without the help of an external keyboard.

i8042.nomux kernel parameter resolves this issue but using that a PS/2
mouse is detected. This input device is unused even when the i2c-hid-acpi
kernel module is blacklisted making the integrated ELAN touchpad
(04F3:3092) not working at all.

So this notebook uses a hid-over-i2c touchpad which is managed by the
i2c_designware input driver. Since you can't find a PS/2 mouse port on this
computer and you can't connect a PS/2 mouse to it even with an official
port replicator I think it's safe to not use the PS/2 mouse port at all.

Signed-off-by: Szilard Fabian <szfabian@...emarch.art>
---
I think the same configuration could be applied to Lifebook U748 and U758
too but I can't test this theory on these machines.
---
 drivers/input/serio/i8042-acpipnpio.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/input/serio/i8042-acpipnpio.h b/drivers/input/serio/i8042-acpipnpio.h
index 028e45bd050b..983f31014330 100644
--- a/drivers/input/serio/i8042-acpipnpio.h
+++ b/drivers/input/serio/i8042-acpipnpio.h
@@ -618,6 +618,14 @@ static const struct dmi_system_id i8042_dmi_quirk_table[] __initconst = {
 		},
 		.driver_data = (void *)(SERIO_QUIRK_NOMUX)
 	},
+	{
+		/* Fujitsu Lifebook U728 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U728"),
+		},
+		.driver_data = (void *)(SERIO_QUIRK_NOAUX)
+	},
 	{
 		/* Gigabyte M912 */
 		.matches = {
-- 
2.42.0