[PATCH] platform/x86: intel-hid: Add HP ProBook x360 440 G1 to button_array_table

[Nikolay Metchev]

The HP ProBook x360 440 G1 convertible sends
 5-button-array event codes
 (0xc4/0xc5 volume-up, 0xc6/0xc7 volume-down for the
 side volume rocker)
 to the intel-hid ACPI device (INT33D5), but it does
 not advertise the
 array through the HEBC capability method. As a result
 button_array_present() returns false, the "Intel HID
 5 button array"
 input device is never created, and the rocker events
 are dropped in
 notify_handler() with "intel-hid INT33D5:00: unknown
 event 0xc4".

 Add the machine to button_array_table so the 5 button
 array input
 device is set up, which makes the side volume rocker
 emit
 KEY_VOLUMEUP / KEY_VOLUMEDOWN as expected.

 Tested on an HP ProBook x360 440 G1: with
 enable_5_button_array=1
 (same code path as this quirk) the kernel logs
 "platform supports 5
 button array" and the rocker generates native
 KEY_VOLUMEUP /
 KEY_VOLUMEDOWN events.

 Signed-off-by: Nikolay Metchev
 <nikolaymetchev@xxxxxxxxx>
From 0d3c907430f3b36e1ce17ae7a786fff78ff2d2f9 Mon Sep 17 00:00:00 2001
From: Nikolay Metchev <nikolaymetchev@xxxxxxxxx>
Date: Tue, 2 Jun 2026 14:25:49 +0100
Subject: [PATCH] platform/x86: intel-hid: Add HP ProBook x360 440 G1 to
 button_array_table

The HP ProBook x360 440 G1 convertible sends 5-button-array event codes
(0xc4/0xc5 volume-up, 0xc6/0xc7 volume-down for the side volume rocker)
to the intel-hid ACPI device (INT33D5), but it does not advertise the
array through the HEBC capability method. As a result
button_array_present() returns false, the "Intel HID 5 button array"
input device is never created, and the rocker events are dropped in
notify_handler() with "intel-hid INT33D5:00: unknown event 0xc4".

Add the machine to button_array_table so the 5 button array input
device is set up, which makes the side volume rocker emit
KEY_VOLUMEUP / KEY_VOLUMEDOWN as expected.

Tested on an HP ProBook x360 440 G1: with enable_5_button_array=1
(same code path as this quirk) the kernel logs "platform supports 5
button array" and the rocker generates native KEY_VOLUMEUP /
KEY_VOLUMEDOWN events.

Signed-off-by: Nikolay Metchev <nikolaymetchev@xxxxxxxxx>
---
 drivers/platform/x86/intel/hid.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/hid.c b/drivers/platform/x86/intel/hid.c
index 0850935..73874d4 100644
--- a/drivers/platform/x86/intel/hid.c
+++ b/drivers/platform/x86/intel/hid.c
@@ -156,6 +156,13 @@ static const struct dmi_system_id button_array_table[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 4"),
 		},
 	},
+	{
+		.ident = "HP ProBook x360 440 G1",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook x360 440 G1"),
+		},
+	},
 	{ }
 };
 
-- 
2.54.0