linux-kernel - [PATCH] ACPI: x86: Force enabling of PWM2 on the Yogabook YB1-X90

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Message-ID: <20260211222242.4101162-1-jekhor@gmail.com>
Date: Thu, 12 Feb 2026 00:22:42 +0200
From: Yauhen Kharuzhy <jekhor@...il.com>
To: linux-acpi@...r.kernel.org
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Hans de Goede <hansg@...nel.org>,
	linux-kernel@...r.kernel.org,
	Yauhen Kharuzhy <jekhor@...il.com>
Subject: [PATCH] ACPI: x86: Force enabling of PWM2 on the Yogabook YB1-X90

The PWM2 on YB1-X90 tablets is used for keyboard backlight control but
it is disabled in the ACPI DSDT table. Add it to the override_status_ids
list to allow keyboard function control driver
(drivers/platform/x86/lenovo/yogabook.c) to use it.

Signed-off-by: Yauhen Kharuzhy <jekhor@...il.com>
---
 drivers/acpi/x86/utils.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index 4ee30c2897a2..418951639f51 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -81,6 +81,18 @@ static const struct override_status_id override_status_ids[] = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 	      }),
 
+	/*
+	 * Lenovo Yoga Book uses PWM2 for touch keyboard backlight control.
+	 * It needs to be enabled only for the Android device version (YB1-X90*
+	 * aka YETI-11); the Windows version (YB1-X91*) uses ACPI control
+	 * methods.
+	 */
+	PRESENT_ENTRY_HID("80862289", "2", INTEL_ATOM_AIRMONT, {
+		DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
+		DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
+		DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
+	      }),
+
 	/*
 	 * The INT0002 device is necessary to clear wakeup interrupt sources
 	 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
-- 
2.51.0