[PATCH] ACPI: x86: Force enabling of PWM2 on the Yogabook YB1-X90
From: Yauhen Kharuzhy
Date: Wed Feb 11 2026 - 17:22:57 EST
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@xxxxxxxxx>
---
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