[PATCH 6.18 367/752] ACPI: x86: Force enabling of PWM2 on the Yogabook YB1-X90

Sasha Levin
2026-02-28T17:53:15Z

From: Yauhen Kharuzhy <jekhor@gmail.com>

[ Upstream commit a8c975302868c716afef0f50467bebbd069a35b8 ]

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@gmail.com>
Link: https://patch.msgid.link/20260211222242.4101162-1-jekhor@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 4ee30c2897a2b..418951639f511 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