ACPI / x86: Make PWM2 device always present at Lenovo Yoga Book

jekhor · rafaeljw · commit ff6cdfd71495 · 2019-02-15T00:19:58.000+01:00
Lenovo Yoga Book uses PWM2 for controlling keyboard backlight but this
device is hidden in the DSDT in Windows version of notebook (if OSID == 1).

Make this device always present for this notebook.

Signed-off-by: Yauhen Kharuzhy &lt;jekhor@gmail.com&gt;
Reviewed-by: Hans de Goede &lt;hdegoede@redhat.com&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
@@ -56,6 +56,11 @@ static const struct always_present_id always_present_ids[] = {
 	 */
 	ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT), {}),
 	ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
+
+	/* Lenovo Yoga Book uses PWM2 for keyboard backlight control */
+	ENTRY("80862289", "2", ICPU(INTEL_FAM6_ATOM_AIRMONT), {
+			DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"),
+		}),
 	/*
 	 * The INT0002 device is necessary to clear wakeup interrupt sources
 	 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
